Markdown nested list with custom style possible?

Question

I use a markdown editor and there I need a list formation according to certain rules.

A. 
I. 
1. 
a) 
aa) 
(1)
(a)
(aa)

To implement this, I added the following to the css file.

<style type="text/css">
   ol {list-style-type: upper-alpha;}
   ol ol { list-style-type: upper-alpha;}
   ol ol { list-style-type: upper-roman;}
   ol ol ol { list-style-type: decimal;}
   ol ol ol { list-style-type: lower-latin;}
   ol ol ol ol { list-style-type: decimal;}
   ol ol ol ol { list-style-type: upper-roman;}
</style> 

This way I can basically create a nested list. But now I want for example that level 6 have brackets before and after the letter.

I know that this is possible by using something like that:

ol {
  counter-reset: list;
}
ol > li {
  list-style: none;
}
ol > li:before {
  content: counter(list, lower-alpha) ") ";
  counter-increment: list;
}

Ordered list (HTML) lower-alpha with right parentheses?

But I am working with different layers and want to apply the change to only one layer at a time.

Can someone perhaps give me a tip on how I can implement this.

With kind regards