They are working on it: https://github.com/jitsi/jitsi-meet/issues/4758. Unfortunately, I think WebRTC support is still not 100% uniform across browsers (there seem to be a range of browser-specific behaviour and bugs), making it hard to easily support all browsers. And Chrome appears to be the browser which implements new WebRTC features the fastest, so I can understand Jitsi Meet focusing their efforts on that platform.
You don't need chrome though, chromium should be enough.
You don't need chrome though, chromium should be enough.