Can you improve arm strength?

Optimus Prime said

QBs are criticized for their lack of arm strength

He can't make this throw, or that throw

His deep passes float on him or lack zip

Is that something that can be greatly improved in the gym/practice or just slightly, or not at all?

If there is a lineman who just needs to get stronger, no one seems terribly worried about it, just work out and get stronger

But I've never heard arm strength talked about like that before

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OP I have wondered that SOOOOO many times in my life it drives me nuts. For example there are kids I know that are pre-teen and can throw a youth football further than I can. And I am stronger in nearly every measurable strength I don't understand it.

As a kid I never had a good throwing arm, my friends would always toss rocks further than me, same for baseballs when I played little league for years.
It just is what it is for me, I am almost 52 and dont care anymore.