Building Chatbots in Copilot Studio: Xerte as a source

Within our school (ROC Midden Nederland: School for Secondary Vocational Education), we have started creating agents / 'chatbots' in Microsoft Copilot Studio.
In Copilot Studio, we can add various sources, such as (PPT, Word, PDF, etc.) documents and also websites.
However, we are now discovering that when we want to add Xerte toolkits and bootstraps as a source, the source does not seem to be readable by Copilot Studio. Therefore, the agent/chatbot cannot answer questions based on the Xerte source.
Is this familiar? And/or is there a solution?