Auto or Easy Rotate to Make It Fit Flat on the Print Bed  

Auto or Easy Rotate to Make It Fit Flat on the Print Bed

I have a general issue of forgetting small things, like rotating a part in my modeling program, before exporting it to print. That's an issue when I build my parts "in place," so I can see them fitting together. I have on part that I designed with a long flat side so it could be printed, but, in place, it's at an angle:

There are times when I tweak parts and export a batch of them for printing, then load them into PrusaSlicer and forget this is not horizontal, like this:

Of course, you can imagine the mess I get if I forget to rotate it and PrusaSlicer puts only one long thing edge onto the print bed.

Is there any kind of auto-rotate-to-flat or similar feature in PrusaSlicer that I can use on a part like this to make that long edge, and an angle, automatically line up so it's horizontal on the print bed? I know I can rotate this part on the axis by typing in the degrees to rotate it, but I'm hoping there might be a feature where the slicer use it to have the slicer automatically rotate it the right amount so that surface is horizontal.

(I get that this is not likely to be something PrusaSlicer does on importing an STL, by "automatically," I mean that when I run the function, that it figures out how far to rotate to sit this part flat, instead of me having to know the exact angle to use. Often parts like this, on a slant, don't have easy to remember angles.)