Quick Accent: Please add alternative Greek Theta glyph: ϑ (U+03D1)

[FrancTheCat]

Description of the new feature / enhancement

Hey there!
I really love the quick accent feature as it gives me the opportunity to write greek letters fast without the use of new shortcuts.

Scenario when this would be used?

As a med student, I often need to type greek letters. The alternative lowercase Theta seems to be missing from the greek character set.

Supporting information

This variant of Theta may used to describe EEG-rhythms and is prefered by some authers over the "θ" variant.

German EEG-Textbook using the ϑ-variant
(Zschocke & Hansen, Klinische Elektroenzephalographie. 2012; Speckmann, Hescheler, Köhling, Physiologie, 2019)

[PesBandi]

I will work on this if I get the team's approval.

[ethanfangg]

approved @PesBandi