I was trying to build it months ago, couldn't find a developer willing to work on it with me. They didn't believe it was a big enough market opportunity.
Now there's already a few people doing this with products in the market. Right from API aggregation to output aggregation and parallel generation.
Study the competitors that already exist right now. See if you can fill any gaps they can't. But you're pretty late to the party imo, difficult to innovate now without your competitors copying and outdoing you with more resources.