Hi Tomas! Out of interest, what kinds of documents are you using Leo to transcribe?
We currently don’t offer the ability to add custom, natural language prompts to customize transcription output. You can try the tips for getting the best possible result that I suggest here.
In the future, the plan is to introduce more features for Leo to learn from corrected transcriptions. One of these will likely be start text (i.e., you transcribe the first few lines of the page, and Leo knows better how to do the rest.