feature: parameter highlighting?

Did you check the tree-sitter docs?

• I have read all the tree-sitter docs if it relates to using the parser

Is your feature request related to a problem? Please describe.

Hi, I'm not very knowledgeable about treesitter so please bear with me if this is in wrong place.

I am trying to understand why/how I could get highlighting to work with parameters inside functions.

Here's a simple example:

int a, b;
void foo(int c) {
   auto g = a * c;
}

In this snippet, I would expect c within the function to have variable.parameter (or similar, I do not know the proper language) value.

So I could have all parameters same color in Helix for example.

Describe the solution you'd like

If it's at all possible, give any variable that is a parameter of a function a variable.parameter value, so that it can be colored in highlighters.

Describe alternatives you've considered

Living without it..? :'D

Additional context

Again sorry if I'm in wrong place and being bothersome, I suspect this has come across before too but I could not find any relevant issues, maybe my searching skills fail me.

Start with the linked tree-sitter parser documentation and the C++ example in the issue; no source file or test is named. Investigate how parameter highlighting is represented for this grammar, then verify that function parameters receive a variable.parameter-like capture and can be colored by a highlighter such as Helix.