Comment by andsoitis

I would pick Delphi (with which you can build Windows, Linux, macOS, Android, and iOS apps - https://www.embarcadero.com/products/delphi)

Alternatively, RemObjects makes Elements, also a RAD programming environment in which you can code in Oxygene (their Object Pascal), C#, Swift, Java, Go, or Mercury (VB) and target all platforms: .Net, iOS and macOS, Android, WebAssemblyl, Java, Linux, Windows.