How can I create a default setting (opacity) for each highlighter color in Adobe?

I want to change the default opacity for each color. Aka, every time I select the light green, it's 70% opacity, and every time I select dark blue, it's 45% opacity. 

The highlight tool is my most frequently used Adobe tool. I color-code documents -- often by sentence/word (citations are green, critical info is bright pink, one project I work with is blue, another is purple.).  Some highlight colors work best at 45% opacity, some at 70%. However, once I change the opacity to, 70% for example, all colors come out 70%. Red is most distinct at 70%, but dark blue at 70% makes the text unreadable. It's very time consuming to drag the opacity slider every single time I switch between colors.

It would also be great if I could set additional color swatches (?). I just want to add a brown swatch to the palette. It's not beautiful, but it's one of my project colors and would allow me to find the information I'm looking for in long documents.

It's 2023 so I can't imagine why this wouldn't be a capability in Adobe. I can't figure out if I'm missing where to set these things, or if it's truly not possible (if it's not: Adobe, come on! It's 2023!).

Any help would be appreciated. Thank you