How to configure File Associations for Intelephense LS

I was not able to find how to configure lspconfig to set the file.associations structure for php files that drupal uses.

In here: nvim-lspconfig/server_configurations.md at master · neovim/nvim-lspconfig · GitHub

There is an example of setting filetypes.

filetypes = { "php" }

In here: GitHub - bmewburn/vscode-intelephense: PHP intellisense for Visual Studio Code They mention what the structure might look like:

"files.associations": { "*.module": "php" }

So for drupal development, inside my nvim-lspconfig.lua I think I would want something like this

local files_associations = {}
files_associations["*.install"] = "php"
files_associations["*.theme"] = "php"
files_associations["*.module"] = "php"
files_associations["*.inc"] = "php"

for _, lsp in ipairs(servers) do
  nvim_lsp[lsp].setup {
    on_attach = on_attach,
    capabilities = capabilities,
    files.associations = files_associations,
    ts_settings = ts_settings,
    flags = {
      debounce_text_changes = 150,
    }
  }
end

But that does not work.

I also see this structure proposed for Coc ( Configuring coc-phpls and intelephense for Drupal 7 · webschneider.org )

{
  "intelephense.environment.documentRoot": "/home/user/git/drupal",
  "intelephense.environment.includePaths": ["/home/user/git/drupal/includes"],
  "intelephense.files.associations": ["*.php", "*.phtml", "*.module", "*.inc"]
}

I see that for the ts_server there is a function delared that sets internal settings so I tried this:

-- Set settings for language servers below
--
-- tsserver settings
local ts_settings = function(client)
  client.resolved_capabilities.document_formatting = false
  ts_settings(client)
end

local file_settings = function(client)
  files.associations = { '*.install', '*.theme', '*.module', '*.inc' }
  file_settings(client)
end

-- local files_associations = { '*.install', '*.theme', '*.module', '*.inc' }

for _, lsp in ipairs(servers) do
  nvim_lsp[lsp].setup {
    on_attach = on_attach,
    capabilities = capabilities,
    files_settings = file_settings,
    ts_settings = ts_settings,
    flags = {
      debounce_text_changes = 150,
    }
  }
end

But that did not work either.

Has anyone gotten file.associations to work with Intelephense LS?