[Feature] AGC header rewrite with client certificate

**Question**
Our application requires the client certificate to be deliverd to the backend api.
Does Application Gateway for Containers (AGC) support forwarding client certificates using header rewrites?

The [docs](https://learn.microsoft.com/en-us/azure/application-gateway/for-containers/how-to-header-rewrite-gateway-api) only show assiging static values.
Are there server side variables available to configure this. (like the [traditional](https://learn.microsoft.com/en-us/azure/application-gateway/rewrite-http-headers-url#server-variables) AG?)