z.lib support (zscale command , --enable-libzimg)

[Tymofiev]

Is your feature request related to a problem? Please describe.

There is barely the only way to convert video from HDR to SDR without colors loss - tonemap filter that is being applied after zscale converting.

Does this package support z.lib, that provide zscale ffmpeg command?
https://github.com/sekrit-twc/zimg

Describe the solution you'd like
Include this lib into one of the package (etc. video, full, full-gpl).

Platform
iOS and Android