Ya' know what the real answer is? Use jAlbum to enter titles and comments, instead of doing it in File Explorer. You don't even have to make an album! The jAlbum core will obediently write out your titles and comments to the files, in the proper xmp fields, where they will be preserved.
You are correct -Yes it does.
I used your no pages. The fields are populated as you say, however the Subject Field isn't because it is not part of jAlbum. I did ask for this year's ago! I remember the original struggle getting Title when jAlbum only had comment!
Things certainly have moved on in the intervening years for the better. Well done team jAlbum.
Finally, and I haven't fully tested this yet, but I don't think Win 10 can view the jAlbum comments that I've entered.
They are in xmp description.
Sorry about lack of time to check this out, but will be away for a week so hope to look again later.
What File Explorer does with xmp metadata is just as perverse as what it does when you enter metadata within File Explorer. If xmp.dc:title exists (the jAlbum title), it shows up in File Explorer as Title. So far, so good.
If xmp.dc:title does not exist, but xmp.dc:description exists (the jAlbum comment), it shows up in File Explorer as Title.
If both xmp.dc:title and xmp.dc:descriptionboth exist, the title shows up as Title in File Explorer, but the description doesn't appear anywhere.
And I'm sure the File Explorer developers assume that they're doing you a favor.