Add a mechanism to allow displaying text in screen corners and on sides

A really useful feature to have would be the ability to show text in all 4 corners of the screen, as well as in the middle on the left and right. Currently, some Java Edition custom servers and resource packs make use of core shaders for this functionality, combined with boss bars or action bars, but having an official functionality would be great. Perhaps a command like /display <corner> <text component> to go along with the client feature.