I use this loop to convert flac to alac :

for i in *.flac; do ffmpeg -i "$i" -y -vn -c:a alac "${i%.flac}".m4a; done

But some tags are not exported. I tried to use the -map_metadata 0 -id3v2_version 2 flag but it does not change anything.

Here you can find the tags that are copied (with or without the -map_metadata) :
original tags

tags copied

When I use XLD Mac software it works perfectly but for some reasons I’d like to use CLI to convert flac files.