Specific formatter configuration for subproject.

[VasilisManol]

I would like to use a specific formatter configuration for a subproject. The way I thought of doing that was adding a new language configuration and use file-types. Like:
languages.toml

[[language]]
name = "javascript_polymer"
language-id = "javascript_polymer"
grammar = "javascript"
file-types = [{ glob = "polymer/*/*.js" }]
scope = "source.js"
formatter = { command = "npx", args = ["@biomejs/biome", "format","--config-path","biome.json","--stdin-file-path", "test.js"] }

It works for the most but syntax is not shown. The output of the command hx --health javascript_polymer:
hx --health javascript_polymer
Configured language servers:
✓ typescript-language-server: .nvm/versions/node/v22.18.0/bin/typescript-language-server
✓ biome: .nvm/versions/node/v22.18.0/bin/npx
Configured debug adapter: None
Configured formatter:
✓ .nvm/versions/node/v22.18.0/bin/npx
Tree-sitter parser: ✓
Highlight queries: ✘
Textobject queries: ✘
Indent queries: ✘

Shouldn't grammar = "javascript" make it use the highlight queries for javascript aswell ? Is there any other way to accomplish it ?