ffmpeg transparent HVEC video from alpha matte and color video

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I have an alpha.mp4 (alpha matte video) and a color.mp4 (color video). How do I use ffmpeg to make a transparent HVEC (.mov) video?

I can combine with ffmpeg to make a .webm file following the instruction here: https://www.unscreen.com/api under "Convert unpacked Pro Bundle to WEBM video with transparency"

I have a newer mac and should be able to use HVEC_videotoolbox from either these 2 videos or the .webm file created.

The closest I found was this which seems to generate a corrupt video that cannot be viewed in safari. Use FFmpeg to generate a movie with alpha channel from separate video and fill movies? but

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