Maps to structures

So, I trying to find a trial chamber in Minecraft Preview on a world I had made in 1.16. Since I've had that world for a long time and explored about a 3x3, level 4 map amount of the world, I couldn't find one. That was most likely because any new chunks that could have one were very far away from my base, and that every cave I was able to find didn't lead me to one. The only way I could find one was when I copied the world, went into creative, and located a coordinate point for one, which was over 3000 blocks away from my base. I was thinking that one way to make it easier for players who have long time worlds to find newer structures is to have cartographer villagers be able to sell maps to those locations. They already sell maps that show the location to Woodland Mansions and Ocean Monuments, so them selling maps to Ancient Cities or Trial Chambers would be nice to have.