Call procedures with custom variables

How I imagine this would work is something like how command parameters work.. but for procedures.

Procedure variables are created either automatically with the "Get procedure variable [name]" block or the same way you make local variables (with the option to define as variable or local)

Below is a rough sketch of what I imagine the blocks would look like with paint.net

- "Get procedure variable [name]" simply gets the defined variable

- "Set procedure variable [name] to [value]" would be used under the purple "Call procedure [procedure] with variable list", defining any of the variables needed. If a variable isn't defined, then it'll return its default value. (or air for item/block variables)

So far the closest thing we have to custom variables is "call procedure at x,y,z". If my idea is possible, that would be awesome.

P.S. If there could also be a way for the "Deal [x] damage to entity" block to let us choose whether or not the damage ignores armor or not, that would also be cool :>