Can I change the function of holding down a key on my keyboard?

I am trying to set up my keyboard so instead of capitalizing a key when I hold it, It uses the number instead. For example: when I hold down "w" instead of capitalizing it, the number 1 comes up instead, or holding down "p", @ comes up instead. Is this possible?

It may be possible if you swipe down from top of keyboard to down. And there will be shor ccut buttons!! Is this ok?

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