Thanks @joshtynjala!
Will check if the changes in grade.build work later today and share the results.
Good to hear hxcpp is going to support NDK 21+ 
Hope Lime could be updated too to support Haxe 4.3.+ 
Actually, I do understand that open source software doesn’t work like this - if I need Lime update I should make this update myself hehe ) Unfortunately, it’s beyond my powers. Or rather I have to focus on the other things.