Hi @KW,
Thank you for posting your question in the Microsoft Q&A.
According to your concern, it's available to automate Excel content into OneNote without embedding the Excel file, but it requires using automation techniques such as Power Automate or Graph API since OneNote doesn't have built-in feature. You need to have an automation flow to read cell values from Excel, then convert them into HTML or XML compatible with OneNote and append this content into the designated template page.
For you receiving the best suggestion and guidance, I recommend posting your scenario in the Microsoft Power Platform Community Forum Thread. This forum is dedicated to Power Automate and is actively monitored by experienced users, Microsoft partners, and engineers who can provide detailed guidance and share best practices.
Apologies for redirecting you to a different community as we're forum moderators, our primary role is to guide users toward the appropriate resources and support channels and the category you initially posted in primarily focuses on Microsoft 365-related topics, therefore we may not have the depth of expertise needed for Power Automate-specific questions.
Thank you for your patience and understanding throughout this process. For any questions or further assistance in the future, please feel free to reach out at any time. Not only will I be happy to assist you, but also all the moderators of the Q&A forum will do their best to provide support and guidance.
I hope everything will be resolved soon. Wishing you a great day ahead.