Unsupported Notes on iMac after iPhone iOS 27 update

I have just updated my iPhone 16 toIOS 27 and now some of my notes does not show on my iMac running macOS Ventura 13.7.8. The message says "Unsupported Note - This note uses unsupported features.

To view or edit it, upgrade to the latest version of macOS." I cannot update to later version of macOS as it is an older iMac. What should I do to get these notes backed up to iCloud and still access on my iMac