Automated iMacros to Ui.Vision macro conversion is theoretically possible, but it would be hugely complex. As open-source RPA software we have limited resources, and prefer to focus on other roadmap that are requested by our users. Cool new features are planned 
However, if you or anyone else wants to write an iMacros to UI.Vision converter, we would be happy to help.
Other users reported that ChatGPT can convert iMacros macros to Ui.Vision syntax. We tested it and while it is far from perfect, but maybe a good starting point for you.