Yes. And many are when you require a common code-base for iOS, Android, and other devices. (But C++ is used more commonly)
Video games are the ones that do this by default. It would be close to impossible to have feature parity by coding a game for iOS in Swift, for Android in Java, for Steam in C++, etc. Unreal or Unity will have C/C++ code-bases with very light integration layers to do system calls.(The payment system may have code in Objective-C, for example, but mostly a wrapper for convenience reasons)
The other extreme is to just use webapps in an electron wrapper. But electron itself is build in C++.
My guess is that most developers are going to use the default Java/Swift combination for mobile development because that is what each company taught in their websites. I would prefer, thou, that engineers were more inclined to use opensource solutions to create common interfaces and avoid vendor lock-in. But cool events and free tutorials are hard to beat.
Before settling on Electron, I recommend exploring Tauri. It's more lightweight, it's better with sandboxing and it allows dropping down to Rust when performance is critical.
It's more lightweight because it doesn't include a browser engine. The obvious downside is that there is more room for compatibility issues. I'm not sure it's worth it.
Video games are the ones that do this by default. It would be close to impossible to have feature parity by coding a game for iOS in Swift, for Android in Java, for Steam in C++, etc. Unreal or Unity will have C/C++ code-bases with very light integration layers to do system calls.(The payment system may have code in Objective-C, for example, but mostly a wrapper for convenience reasons)
The other extreme is to just use webapps in an electron wrapper. But electron itself is build in C++.
My guess is that most developers are going to use the default Java/Swift combination for mobile development because that is what each company taught in their websites. I would prefer, thou, that engineers were more inclined to use opensource solutions to create common interfaces and avoid vendor lock-in. But cool events and free tutorials are hard to beat.