Can you add arrow keys to an iOS 15 keyboard?

I am using GitPod, an in-browser IDE, in iOS Safari on my iPhone SE 2.

I would like to be able to enter up, down, left and right arrow key input to move the cursor in the IDE’s terminal and to retrieve previous commands from the shell.

This SE post from 2012 says that there is no way to modify the iOS keyboard: Can arrow keys be added to an iPhone keyboard?.

Have things changed since then? Is there any good “Hacker’s Keyboard” for iOS or is there in theory a way to make one given the iOS development tools?

Alternative keyboards have been available for iOS since iOS 8 in 2014, there are tons of them in the App Store. That's the place to look for one with arrows. An example.