Nope, just a way to enter text via the PlayCanvas rather than to resort to a pure HTML5 UI/form.
It’s should technically be possible now by changing the fillMode to fixed and giving it the desired height/width: https://developer.playcanvas.com/api/pc.Application.html#setCanvasFillMode
It may need a bit of CSS work that’s been mentioned in this post as switching between fill modes is not a common use case and there may be a few issues: https://forum.playcanvas.com/t/solved-trying-to-switch-between-fill-mode-to-keep-aspect-ratio/26874
However, this doesn’t work in this case of my project because you can hide the keyboard with the input box still up and iOS does funny things with innerHeight/innerWidth.
It would also mean that it could look odd if they hid the keyboard and resized the window, change orientation etc.