Unable to input non-Roman characters

Using GBoard and related keyboards, it is impossible to input Chinese, Korean, Japanese and similar characters into the KWGT "formula" field natively. These characters can still be used by copying/pasting them into this field, however when entering the field, the keyboard is forced into roman-character-only-mode and this cannot be overridden either from within KWGT or GBoard's settings.

I believe this to be an oversight, and am very surprised this has not been mentioned before.

Edit: it appears Hindi input works. (thanks to @Spiritsmaker#6602 from Kustom Discord)

Relevant system info:

KWGT Pro; APK version 3.38b903018 (latest)

Android 9.0; OxygenOS 9.0.12 (latest, stable)

Device: OnePlus 6T (A6013, stock firmware)