Need help to contribute injection

[ignamartinoli]

Hi, I would like to contribute with an injection for Hyperscript.

It is an embedded language that should be put inside the _ tag.

Here is a Treesitter grammar: https://github.com/dz4k/tree-sitter-_hyperscript

I came up with this query to inject it:

((attribute
  (attribute_name) @name
  (quoted_attribute_value
    (attribute_value) @value))
 (#eq? @name "_"))

I would like to open a PR, but I am a bit lost.

After looking at the injection file, I assume that what I should put there is:

((attribute
  (attribute_name) @name
  (quoted_attribute_value
    (attribute_value) @value))
 (#eq? @name "_")
 (#set! injection.language "_hyperscript"))

Am I right? Any feedback is appreciated.