Can we get the latest ffmpeg (nightly) build? It finally correctly remuxes atmos mkv to mp4

2 weeks ago, ffmpeg finally added proper mp4 support for Dolby Atmos.

I was wondering if there's a way to download the latest nightly ffmpeg into a-shell

Alternatively, can the developer update a-shell with the latest nightly (maybe as an option)?

I use a-shell with a shortcut to remux downloaded mkv files to mp4 and as of 2 weeks ago, ffmpeg finally added support for correctly tagging the output mp4 files with JOC complexity levels (so now output files contain proper functioning atmos)