Display image without loading it as array

I want to show data on top of a map in an other projection than Mercator. For this I can create an image file containing the map, but while the image only takes ~20MB compressed uncompressed it is >1GB. I was considering to generate tiles and serve them locally, but the tile source URL format only really works with the Mercator projection (correct me if I’m wrong).

Is it possible to show an image as background (no need for information on hover) without using hv.RGB?