Mercy Sparx (3rd Series) Issue 1 variant question

[James J. Reaves]

So I just updated my Comic Base software for the first time in years, and I am trying to enter stuff. Steep learning curve, for sure.

But I hit a snag here. I have a CGC-graded copy of Mercy Sparx (3rd Series) #1. There is no cover price or UPC. The cover itself is blank, with a convention sketch by Josh Blaylock. It doesn't match any of the listed variants in the database. Obviously, I can't open it to find any UPC  hidden on the inside. Any ideas?

[Steven L. Dasinger]

It looks like this should go in Mercy Sparx (3rd series) as a new variant 1/E blank cover variant.

You can see it at the Grand Comics Database (GCD) here: https://www.comics.org/issue/1248491/.