Hey there–
This is new to me so apologies if my advice doesn’t solve this. I found another person here that is trying to work with similar settings. Have you attempted to set the proxy settings with the DREMIO_JAVA_EXTRA_OPTS setting in the dremio-env file in your conf folder?
How to connect Dremio with GCS storage using proxy - #7 by Pawel has an example.
Dan