iPad entering dimensions without a keyboard

I am using sketchup web with an ipad, but without an auxiliary keyboard. How do I enter dimensions for drawing a line order rectangle when there isn’t a keyboard available? Or, how do I make the ipad keyboard appear when need?

I just tried it on my iPad Pro, and it’s a no-go. I can’t even get the on-screen keyboard to show up. Seems an external keyboard is your only real option if you’re just using the browser based version.