Is there a way for me to add extra headers in loki sink configuration?

[LinTechSo]

Hi,
assuming we want to add more headers like api token auth header like below to loki sink:

    request:
      headers:
        "api-key" : "token"

I think i can do above via http sink but loki sink gives me more features and etc
I would appreciate it if anyone could help or provide guidance.
similar feature request: #21332

[jszwedko]

I think this is a missing feature. Thanks for opening the request!