(I saw in other community posts that you are mostly kept up do to the war in your country. Don't feel a need at all to check this out, focus on your personal health and other more important things instead.)
I decided to add kerning pair support to my primary game font, yet every time I export the font, it doesn't export with any kerning pairs at all!
This also applies to other fonts I make for game jams and other stuff.
(I'm pretty sure my stuff is alright, because It shows up in the font editor, yet not in any other software.)
In the Font Editor
In My Game Engine of Choice (Godot)
In Other Software (Paint.net)
Here's the json if you want to see it.