Tenant headers cannot be duplicated using Grafana datasources

[john-r-swyftx]

The suggested way to provide multiple values using http headers is:

You can provide multiple values for the label using several HTTP headers:

➜  ~ curl -H 'X-Tenant=something' -H 'X-Tenant=anything' http://127.0.0.1:8080/api/v1/query\?query="up"
{"status":"success","data":{"resultType":"vector","result":[]}}%

Grafana datasources do not support more than one http header with the same name being set.

will just send one THANOS_TENANT header.

Grafana for Loki allows the format - A|B for its tenant headers. Can this be supported with prom-label-proxy?

Or is there a way around this I haven't seen yet? I am trying to query across 2 tenants