Setting Cover Description

Is there no way to use action groups to set the cover descriptions?

I can filter files by %_cover_description% but if i try to format that value in an action a new field is created & data is not written to the actual cover description.

I have just tested these properties:
image
and they were set as expected.

Could you please show us your settings in your "Set cover properties" Action?

You may notice that this property descriptor name starts with an underscore and can be found as "information field" - which means that it is read only.
The way to manipulate it has been described by @LyricsLover

I wanted to use a "formula" to set the cover descriptions that way I could run the action in batch & not have to think about it.

This method works perfectly although I'm not able to use any format strings. I will simply need to make a nested group of action groups for all the most common descriptions I wish to use for covers. Thank You @ohrenkino @LyricsLover

What kind of format strings would you like to use as "Cover description"?

I just tried to use %genre% as a test but it prints exactly "%genre%" rather than the contents of the field GENRE

If I could get it working I'd have it pull info from a custom field that is already "calculated" like COVER DESCRIPTION

$IF($AND($grtr($strstr(%title%,'(Instrumental)'),0),%ALT ART%),'ALT ART: Instrumentals',%coverdescription%)

Then I'd just remove the field COVER DESCRIPTION after the cover properties are set.

I have many albums where I've gone an acquired the instrumentals live versions or acapella versions, remixes etc. I add them to the original album under a new disc & usually make a slight edit to the original cover so that I can easily distinguish alternate versions of tracks.