Equivalent Coral2 of /libs/granite/ui/components/coral/foundation/authorizable/autocomplete
I have created one page property named: Content Approver Group with sling:resourceType: granite/ui/components/coral/foundation/authorizable/autocomplete
This autocomplete page property named: Content Approver Group is designed to allow the content authors to pick the user group from suggested list as shown in below screenshot -

Here is node and property details associated with Content Approver Group

But I would like to implement the same in coral2. I feel if I refer Participant Step component in AEM6.2 then I will be able to implement the same in coral2.
How can I get the AEM 6.2 quickstart jar? Please suggest.