How to show keyboard on android with NVGT?

Hi, so a few days ago I made a calculator with several menus using NVGT. The calculator works fine on the Windows platform, and I also made a gesture to Android. The app runs as expected, however I can't get the keyboard to show up on the input field I created. Are there any references or solutions to make my NVGT app can show the keyboard on Android so I can input characters?

Already discussed in issue on GitHub, they're still working.