Pass an additional header from the incoming request to the token introspection API

Currently all protected endpoint request in my application forwarded to token introspection endpoint which we handled internally. During the forward by using Kong oauth2-introspection plugin and working fine. I need to pass an additional header from the incoming request to the token introspection API. Please clarify me the approach how to achieve this.

Example:
Current Implementation:
https://abc.com/xyz
Request Header:
Authorization, Channel
Token Introspection API receives:
(no other headers)
https://abc.com/token-introspection?token=authtoken

Expected Implementation:

https://abc.com/xyz
Request Header:
Authorization, Channel=Web
Token Introspection:
Expected :
Header: Channel=WEB
https://abc.com/token-introspection?token=authtoken

Explored below Kong plugin to forward the header to introspection URL and all are not working.

  1. oauth2-introspection plugin
  2. request-transformer-advanced plugin
  3. request-transformer plugin
  4. oidc introspection plugin
  5. prefunctionection plugin