Printing alternatives on tagFormat

[Donuk]

I hope this heading makes sense - I am not good perhaps at describing what I want - simply:
I normally use Lumin, although sometimes the Linn control apps.

On my streamer playlists and on the listing on the streamer, I like to see other information besides just the Title and artist. To that end I have evolved this:
Title.displayFormat={$title^$date^ ~ ^$comment^~ ^$composer^ [^]}

In my comment field I put things like HD for High definition.

This works fine so that, as an example I get:

Across the Universe ~ 1968 HD [John Lennon ~ Paul McCartney]

I like to keep my FLAC files reasonably up to date in metadata with Composer information &c. I use Tag Editor on my Mac.

Now I am wondering if it is possible to put some sort of if-then statement and print something other than the contents of the field.
For example, I would like to put in my Titel.displayFormat expression something like

If comment="HD" then print "*", and for the icing on the cake: If comment is not equal to "HD" then print "" (nothing).

In other words, if I have HD in the comments field I get this
Across the Universe ~ 1968 * [John Lennon ~ Paul McCartney]
If I have nothing or something else in the comments field I get
Across the Universe ~ 1968 [John Lennon ~ Paul McCartney]

Sorry if I am not making sense. I could have written what I want in BASIC 40 years ago, but done nothing since!

Any thoughts?? Yes I know it is not a life or death issue, but would be fun.

donuk, sunny downtown York