Does it support configuring the model provider?

Does it support the environment variable configurations mentioned on the page at https://docs.github.com/en/copilot/how-tos/copilot-cli/customize-copilot/use-byok-models#configuring-your-provider, such as COPILOT_PROVIDER_BASE_URL, COPILOT_PROVIDER_API_KEY, etc.? Will it be supported in the future?

Start by reviewing the linked GitHub Copilot BYOK documentation and the listed environment variables, including COPILOT_PROVIDER_BASE_URL and COPILOT_PROVIDER_API_KEY. Determine the current language server behavior and define the required support or documentation before implementation; done should include a clear answer about support and its future scope.

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