Support for Custom Endpoints

I want to use codex with an endpoint that doesn't end with /chat/completions. For example the default endpoint on Databricks is /invocations. The code below works, but as far as I can tell there's no way of getting codex working with this endpoint at the moment:

curl -X POST "https://adb-12345678910.1.azuredatabricks.net/serving-endpoints/databricks-llama-4-maverick/invocations" \
  -H "Authorization: Bearer $DATABRICKS_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"messages": [{"role": "user", "content": "test"}]}'

LibreChat have had a similar issue, and they solved it by adding a directEndpoint and titleMessageRole setting. I'm not sure what the most elegant way to implement this is, but it would be nice if Databricks endpoints were supported.