There were a couple comments about Vial in this github issue VIA/Remap Support · Issue #14 · FrameworkComputer/qmk_firmware · GitHub
No response though.
I suspect that they are busy with everything concerning the Framework-16, so it might be hard to get an official Vial fw build.
I do think Vial is a much better option than Via, more configuration option than Via, and it just aligns better with Framework’s ethos. But Vial is less known, so fewer voices to let Framework know it’s better.