diff --git a/packages/react-native-bridge/android/react-native-bridge/src/main/java/org/wordpress/mobile/ReactNativeGutenbergBridge/GutenbergWebViewActivity.java b/packages/react-native-bridge/android/react-native-bridge/src/main/java/org/wordpress/mobile/ReactNativeGutenbergBridge/GutenbergWebViewActivity.java
index ccc3682a2c661e..2b3302b75e2575 100644
--- a/packages/react-native-bridge/android/react-native-bridge/src/main/java/org/wordpress/mobile/ReactNativeGutenbergBridge/GutenbergWebViewActivity.java
+++ b/packages/react-native-bridge/android/react-native-bridge/src/main/java/org/wordpress/mobile/ReactNativeGutenbergBridge/GutenbergWebViewActivity.java
@@ -333,10 +333,18 @@ private void injectCssScript() {
                 String injectWPBarsCssScript = getFileContentFromAssets("gutenberg-web-single-block/wp-bar-override.css");
                 injectWPBarsCssScript = removeWhiteSpace(removeNewLines(injectWPBarsCssScript));
                 evaluateJavaScript(String.format(INJECT_CSS_SCRIPT_TEMPLATE, injectWPBarsCssScript));
+
+                String injectExternalCssScript = getOnGutenbergReadyExternalStyles();
+                injectExternalCssScript = removeWhiteSpace(removeNewLines(injectExternalCssScript));
+                evaluateJavaScript(String.format(INJECT_CSS_SCRIPT_TEMPLATE, injectExternalCssScript));
             }
         });
     }
 
+    protected String getOnGutenbergReadyExternalStyles() {
+        return new String();
+    }
+
     private void injectOnGutenbergReadyExternalSources() {
         List<String> list = getOnGutenbergReadyExternalSources();
         for (String file : list) {
diff --git a/packages/react-native-bridge/ios/GutenbergWebFallback/FallbackJavascriptInjection.swift b/packages/react-native-bridge/ios/GutenbergWebFallback/FallbackJavascriptInjection.swift
index 177eaf80eb1abd..13ae9dd1f05735 100644
--- a/packages/react-native-bridge/ios/GutenbergWebFallback/FallbackJavascriptInjection.swift
+++ b/packages/react-native-bridge/ios/GutenbergWebFallback/FallbackJavascriptInjection.swift
@@ -60,14 +60,6 @@ public struct FallbackJavascriptInjection {
     }
 }
 
-public extension SourceFile {
-    func jsScript(with argument: String? = nil) throws -> WKUserScript {
-        let content = try getContent()
-        let formatted = String(format: content, argument ?? [])
-        return formatted.toJsScript()
-    }
-}
-
 internal extension String {
     func toJsScript() -> WKUserScript {
         WKUserScript(source: self, injectionTime: .atDocumentEnd, forMainFrameOnly: false)
diff --git a/packages/react-native-bridge/ios/GutenbergWebFallback/GutenbergWebSingleBlockViewController.swift b/packages/react-native-bridge/ios/GutenbergWebFallback/GutenbergWebSingleBlockViewController.swift
index c077b3aaf1204b..9159b847d52cbd 100644
--- a/packages/react-native-bridge/ios/GutenbergWebFallback/GutenbergWebSingleBlockViewController.swift
+++ b/packages/react-native-bridge/ios/GutenbergWebFallback/GutenbergWebSingleBlockViewController.swift
@@ -58,6 +58,12 @@ open class GutenbergWebSingleBlockViewController: UIViewController {
         return []
     }
 
+    /// Requests a set of CSS styles to be added to the web view when the editor has started loading.
+    /// - Returns: Array of all the styles to be added
+    open func onGutenbergLoadStyles() -> [WKUserScript] {
+        return []
+    }
+
     /// Requests a set of JS Scripts to be added to the web view when Gutenberg has been initialized.
     /// - Returns: Array of all the scripts to be added
     open func onGutenbergReadyScripts() -> [WKUserScript] {
@@ -152,6 +158,7 @@ extension GutenbergWebSingleBlockViewController: WKNavigationDelegate {
         evaluateJavascript(jsInjection.injectWPBarsCssScript)
         evaluateJavascript(jsInjection.injectLocalStorageScript)
         onPageLoadScripts().forEach(evaluateJavascript)
+        onGutenbergLoadStyles().forEach(evaluateJavascript)
     }
 
     public func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
@@ -160,6 +167,7 @@ extension GutenbergWebSingleBlockViewController: WKNavigationDelegate {
         evaluateJavascript(jsInjection.preventAutosavesScript)
         evaluateJavascript(jsInjection.injectEditorCssScript)
         evaluateJavascript(jsInjection.gutenbergObserverScript)
+        onGutenbergLoadStyles().forEach(evaluateJavascript)
     }
 }
 
diff --git a/packages/react-native-bridge/ios/SourceFile.swift b/packages/react-native-bridge/ios/SourceFile.swift
index ee0e0b54fe4a67..2f75e22278c0f1 100644
--- a/packages/react-native-bridge/ios/SourceFile.swift
+++ b/packages/react-native-bridge/ios/SourceFile.swift
@@ -20,7 +20,7 @@ public struct SourceFile {
         self.bundle = bundle
     }
 
-    func getContent() throws -> String {
+    public func getContent() throws -> String {
         guard let path = bundle.path(forResource: name, ofType: type.rawValue) else {
             throw SourceFileError.sourceFileNotFound("\(name).\(type)")
         }
@@ -28,6 +28,21 @@ public struct SourceFile {
     }
 }
 
+extension SourceFile {
+    public func jsScript(with argument: String? = nil) throws -> WKUserScript {
+        let content = try getContent()
+        let formatted = String(format: content, argument ?? [])
+        
+        switch self.type {
+        case .css:
+            let injectCssScriptTemplate = "window.injectCss(`%@`)"
+            return String(format: injectCssScriptTemplate, formatted).toJsScript()
+        case .js, .json:
+            return formatted.toJsScript()
+        }
+    }
+}
+
 extension SourceFile {
     static let editorStyle = SourceFile(name: "editor-style-overrides", type: .css)
     static let wpBarsStyle = SourceFile(name: "wp-bar-override", type: .css)
diff --git a/packages/react-native-editor/CHANGELOG.md b/packages/react-native-editor/CHANGELOG.md
index bd1c20821200e2..4ee7e30cdebcd4 100644
--- a/packages/react-native-editor/CHANGELOG.md
+++ b/packages/react-native-editor/CHANGELOG.md
@@ -11,7 +11,9 @@ For each user feature we should also add a importance categorization label  to i
 
 ## Unreleased
 
+-   [*] Hide help button from Unsupported Block Editor. [#37221]
 -   [*] Add contrast checker to text-based blocks [#34902]
+
 ## 1.69.0
 -   [*] Give multi-line block names central alignment in inserter [#37185]
 -   [**] Fix empty line apperaing when splitting heading blocks on Android 12 [#37279]