Environment variables for specific branches

Hello, I was wondering if there was a way to set environment variables for specific branches in Cloudflare Pages. For example, say I have a Production branch, and then Preview deployments for develop and staging. I would want different environment variables for the develop and staging branches. Is it possible to do this? In the UI, I only see a way to set environment variables for the Production and Preview deployments, but setting the Preview deployments environment variables will set them the same for develop and staging.

Thanks.