Comment 1 for bug 1820807

(I'm not a KiCad developer.)

It's not by any means necessary to use external tools. It's pretty easy and quick to create rounded corners with arcs, especially with version 5.1. I have planned to record some videos about drawing graphics in KiCad which would show how easy it is. I woulnd't of course oppose having a fillet tool but I don't feel any need for it.