How to create custom outputs for a key long press?

[Manteam111]

Good evening! I'm coding for iOS. I'd like to change the action that occurs when I long press certain keys, but I'm struggling to find instructions to do so in the documentation. I'd like to have the keyboard output "ā" when I long press the "a" key when English is the selected language. That's just one example, but I'd like to do the same for other special characters such as æ, ǣ, ġ, ċ, ȳ, etc. without it popping up with a selection menu with various accents. Ideally, it would be amazing if I could assign actions like cut, copy, and paste to keys long presses as well. Is there any way to adjust the keyboard's response to key long presses?

Edit:

I'd like to to also assign the following actions if possible:

Long press Enter to dismiss keyboard

Long press the 123 key or Emoji key to toggle swipe to type vs swipe left to delete gestures

[xevifar]

Hey @Manteam111 ,

Just handling this over Discord.