Customizeable UI Text/Texture Elements

I think it would be awesome to be able to place custom text/texture in arbitrary places on the screen with commands. We have display entities, we have the scoreboard, we have the bossbar, but nothing that allows us to place things on the screen at specific coordinates.

I propose a system whereby you could use a command to define a coordinate on the screen and place custom text/texture for a limited duration. This would allow data pack and plugin developers to expand their custom UIs, as well as players, for in-game interfaces. This could be an extension of the actionbar command system or its own system for UI.