Question on ID_USLT tag field

Hello everybody,
I would appreciate if LAME would support (unsynchronised) lyrics in
ID3v2 tags (ID_USLT field).
While I came up with something to add support for it,  but I would
like to have more expert people opinions.
The patch file is currently available at
https://github.com/maffo999/lame_lyrics_patch/blob/main/patch-libmp3lame_id3tag.c

My main concerns are:
1) did I miss something or added some code which was not needed?
2) would it be better to reuse the same functions used for ID_COMM
field or use separate ones as it is now?

I would also be happy if you'd like to consider including this patch upstream.

Kind regards
Lorenzo