Brotli compression & PHP bypass

I want to use the snippet to bypass PHP (https://www.keycdn.com/support/wordpress-cache-enabler-plugin#apache), my server supports Brotli compression. However, the snippet seems to trigger the fallback to GZIP which is already indicated by the file extension .gz in the “#compression cache key” section. What changes do I have to make to the snippet to make it work with Brotli?