Will this work as a workaround for npc scan overlay?

i am posting here as a question about an add on that has 20,608,776 downloads, has only had 30 views, and no replies in the ui thread. i wonder do people even know that section even exists! im sure more than 30~ people would like a npc-scan overlay add on that works.

this add on has not been updated, and we dont know if its even possible (even though the author said he is working on in, but this has been ongoing since BfA launch) due to changes made in BfA.

so, first off, is there a similar add on to the overlay?

second, (as i dont think there is), is there a way to put pins on your map like you can on wowhead. i think i have seen this done in the past, with some add on: waypoints? tomtom? im not sure.

while this wont show paths, it would at least show confirmed spawn areas.
but if this is possible, is it possible to make these permanent, and not “despawn” when you log out.