tree-sitter-api-notation

This is a tree-sitter parser for api-notation. It also has a built-in neovim plugin if you use nvim-treesitter.

Neovim plugin

If you use nvim-treesitter, you can also include this as a plugin and it will configure the file types and highlights.

require('lazy').setup({
    ...
    'nvim-treesitter/nvim-treesitter',
    'https://git.sr.ht/~rbdr/tree-sitter-api-notation'
    ...
}