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It sounds like this may need rewriting into a custom visitor group criteria
Below is the link to the guide on how to do this
In the screenshot below, I drew a red line which is where a Javascript file can be attached in which would replicate the Dojo widget you have previously built

Hope this helps or puts you in the right direction
In CMS-11 we were able to create multi-select options in visitor group criteria in this way:
It looked so:
But in Optimizely(CMS 12) DojoWidget is deprecated and must be replaced with CriterionPropertyEditor. But how i can enable this multi-select option then?
Edit: If i use the deprecated way, i get an error in the UI: