AdobeWebM is adding AV1 support for webm files in premiere and after effects btw. It already has vp9 and 8 support! But yeah I'm hoping it becomes ubiquitous in the future.
AdobeWebM is a plug-in to support webm for after effects and premiere and media encoder and etc. And yeah adding AV1 support is almost as simple as adding a lib to cmake but once you start looking into hardware acceleration things get trickier quickly. For the most part the core plug-in is easy enough, parse the matroska/mkv/webm file, read keyframes positions etc, seek and decode frame packets from the stream.
