Converting a Chrome extension to Safari is now piece of cake, as Safari is supporting Safari Web Extensions.
"A Safari web extension adds custom functionality to Safari using JavaScript APIs and common file formats from extensions for Google Chrome, Mozilla Firefox, and Microsoft Edge browsers. "
Source: Apple Developer Documentation: https://developer.apple.com/documentation/safariservices/safari_web_extensions
Could you package the existing Chrome extension so that it works with Safari?
Thanks a lot!