Expand body representation in image generators

Even with key words like “voluptuous”, “heavy set”, “curvy”, “thick”, and even “fat” - all these image models over represent skinny white body types. Lustify does the best but does seem to favor the extremes. Pony Realism is the worst. It's hard to get normal body variants though any of these models consistently. Is there a way we can fund human models to be able to add their data to these image generation model to fix this?