AV1 Image File Format (AVIF) is a newer image file format. The first version of the AVIF specification was published in February 2019, and started to be widely supported in modern browsers in 2021. Making new formats as common as todays mainstays necessitates them being accepted as one you can use for all purposes. Because of that, we believe AVIF should be allowed as a source format.
The test is simply if each format is an accepted as source file for optimization. This is, by nature, custom to each tool and service.