Linux Mint 18.3 (= Ubuntu Xenial), Gimp 2.8.16
In Gimp Text Editor (something you can show when you're entering text using Text Tool) you are meant to be able to go Ctrl-Shift-U + Unicode code... and the symbol in question is meant to be shown.
This appears to be dependent on using the right kind of font (presumably one covering the Unicode code pages in question).
It never, ever works for me. Going Ctrl-Shift-U does not print "u", just nothing at all. Entering the hex or decimal code for the code point just prints those numbers + letters as text.