Local PPTs based on a Template

I have been looking to build a locally hosted app that can take template ppt and generate a PPT files based on a prompt - augmented via RAG to feed the similar PPT files which were created manually previously. I am building a RAG pipeline to parse the historical files and feed it into a locally hosted Mistral Model using Ollama thru Langchain, and using python pptx finally to generate the PPT file. Can you please advise alternate or easy ways to do this?