How to force call-open on-screen keyboard android?

Question

Android

Hello.
I have an android application from third party developers. There are no more developers.
The application was created to enter numbers strictly from the built-in hardware keyboard. That is physical buttons. Especially for a certain android device, with this push-button keyboard.
Here I put it on my smartphone - do I need to somehow force the on-screen keyboard android?
That is, I just need an application from the play market, in which it will be possible to bind a button to the appearance of the keyboard.
Thank you!

Answer 1

https://apkgk.com/ru/jp.co.indra88.showkey