Hello @Sergei! 👋
I'm happy to share that this is already a feature! Data transmitted between devices by Apple's Universal Clipboard feature is encrypted by Apple. However, Universal Clipboard does technically copy your password from 1Password and send it over a network connection to another device without 1Password's encryption and security so 1Password leaves the feature disabled by default for the apps.
You can enable the feature by selecting the icon for your account or collection at the top left corner of the app and then choosing Settings > Security. Turn on Use Universal Clipboard to copy to other devices. You'll need to make sure that this option is on in the 1Password app on all of your Apple devices.
I hope that helps!
-Dave