Add custom hotkeys for annotating screenshots

Hi everyone,

I often use Cmd + Shift + 4 on my Mac to take screenshots and then annotate them using the built-in Markup tools. When I’m marking things up, I frequently draw rectangles and arrows to highlight parts of the screenshot.

I’d love to make this process faster — ideally, after I press Cmd + Shift + 4 (or use the floating thumbnail to open Markup), I could simply press R to instantly switch to the rectangle drawing tool instead of having to click it manually every time (same as how https://shottr.cc does things)

Is there any way to add a keyboard shortcut for the different tools in this markup window. I can't even find that markup window as a separate app in my Applications to try and check the settings.

Thanks in advance for any help or ideas!