I recently purchased the multi-select dropdown component from Blupry (you can check it out https://www.framer.community/c/support/multiple-selection-for-dropdown-forms) to address this exact issue. The component works great, and the Blupry support team helped me customize it to fit my needs. They provided excellent support and made the entire process seamless. If you're looking for a multi-select solution, I highly recommend their template!
https://www.framer.community/c/support/multiple-selection-for-dropdown-forms#comment_wrapper_72527111