Honestly, for these cases focus on JXL. It supports lossless re-packaging of existing JPEG with compression benefits, more or less matches AVIF while having muc

Honestly, for these cases focus on JXL. It supports lossless re-packaging of existing JPEG with compression benefits, more or less matches AVIF while having much options for much better compression times. But if JXL isn't an option, definitely AVIF.