Check Existing Issues

• I have searched for all existing open AND closed issues and discussions for similar requests. I have found none that is comparable to my request.

Verify Feature Scope

• I have read through and understood the scope definition for feature requests in the Issues section. I believe my feature request meets the definition and belongs in the Issues section instead of the Discussions.

Problem Description

Simple change: to include user header information for external cost tracking for TTS requests to OpenAI endpoints.

Desired Solution you'd like

Add user header information to the requests

Alternatives Considered

none

Additional Context

none