I'm an artist. I have several pixel art fonts prepared like so.

Godot, accepts only TrueType and FNT file formats. My images are of raster pixels so obviously a conversion needs to take place. Vector graphics are fine, but I'd like to keep the pixel squares in my design and have them remain aligned with the pixels on screen.
Is anyone aware of a method to build a font from a PNG without too many headaches? I could always make my own text writer using sprites, but that sounds like meaningless reduplication of effort when I Godot provides such useful Label nodes.