2d Tilemaps in 3d scene

Godot Version



So I have transfered my 2d game into 3d because of render order difficulties, and I would like to use my tilemaps in the 3d game. I am aware of Gridmaps, but I do not want to use meshes, so I was wondering if there was some way to put the tilmaps on a plane using viewports or something?
Project the tilemap onto a plane like in above image?