Table of Contents: Try maintaining block example attributes (#65549)

Co-authored-by: aaronrobertshaw <[email protected]>
Co-authored-by: ramonjd <[email protected]>

packages/block-library/src/table-of-contents/block.json

@@ -62,6 +62,57 @@
 			}
 		}
 	},
-	"example": {},
+	"example": {
+		"innerBlocks": [
+			{
+				"name": "core/heading",
+				"attributes": {
+					"level": 2,
+					"content": "Heading"
+				}
+			},
+			{
+				"name": "core/heading",
+				"attributes": {
+					"level": 3,
+					"content": "Subheading"
+				}
+			},
+			{
+				"name": "core/heading",
+				"attributes": {
+					"level": 2,
+					"content": "Heading"
+				}
+			},
+			{
+				"name": "core/heading",
+				"attributes": {
+					"level": 3,
+					"content": "Subheading"
+				}
+			}
+		],
+		"attributes": {
+			"headings": [
+				{
+					"content": "Heading",
+					"level": 2
+				},
+				{
+					"content": "Subheading",
+					"level": 3
+				},
+				{
+					"content": "Heading",
+					"level": 2
+				},
+				{
+					"content": "Subheading",
+					"level": 3
+				}
+			]
+		}
+	},
 	"style": "wp-block-table-of-contents"
 }