Document Embeddings (Fine Tuning Models)

This is the #1 feature I need from a tool like Jasper (and the reason I can't leave them, yet). I need to store multiple personas for each of my clients. And I need be able to train the model (their persona) on hundreds of client documents, websites, etc. That way I only need to enter simple prompts about what that client needs written right now, and the model/persona/ai writing tool already knows the full context of their company, products, market data, marketing strategies, employees, avatar, reviews, etc, etc, etc.