Missing tag for ORIGINAL ALBUM resp. TOAL

[Alandbush]

(07-11-2020 23:16)PeterG Wrote:  With 'mp3tag' these tags could be filled/created for FLAC resp. MP3 files, but are not directly addressable in the properties of MS 2.0 (full license) and do not appear in the tag conversion list.
Existence and content checked with hex-editor HxD.
I tried the following workaround with a tag that I don't use:
alias section: TOAL:-discsubtitle, "ORIGINAL ALBUM":-discsubtitle
index tag section: discsubtitle:orig.Album
$discsubtitle also is used in my displayFormat options.
But it doesn't show up as index nor is it displayed.
Where's my/the fault?
Any help welcome.

A more definitive answer, as to whether the above tags are recognised, should come from using the writeAllTags property.