The plugin works for Gimp-2.10.38.
It may be a bit unintuitive but just read the
Pocholo instructions.
I noticed that you like to use your own background - so I added such an option in
Ver.3 - Bauble type: "From active layer"
(and by the way I changed the gui a bit and added "Add stars?").
Ver.3 in menu: Filters ➤ Render ➤ Christmas Bauble...
Examples:
with the use of active layer

with the use of color

with the use of pattern

About fonts:
MerryChristmasFlake.ttf and MerryChristmasStar.ttf - very nice but:
License
This font is for PERSONAL USE ONLY and requires a license for commercial use.
Kingthings Christmas 2.2.ttf - free for you to use for any purpose you wish (added to attachment).