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@alaa_wmde: is this about Wikimedia-Hackathon-2019 or Wikimania-Hackathon-2019 ? Just making sure...
It seems like this property can be specified on items in order to customize their UIRs in the RDF mapping https://www.wikidata.org/wiki/Property:P1921
The proposal discussion of that property is here https://www.wikidata.org/wiki/Wikidata:Property_proposal/Archive/33#P1921
@Lydia_Pintscher we were looking at how to allow importing concepts from other ontologies into Wikidata while keeping their URIs preserved somehow, then I found about the property mentioned in my comment that seem to serve that need.
Though for some reason that property has a regex constraint that harcodes http|https as the allowed schemes in those URIs. I didn't see anything in it's proposal discussions about that so it probably was added later. I may later again look into this detail and figure out whether it really needs to be that way.
The constraint is in the hands of the editors so the best way forward would be for the person who requested it to bring it up on the talk page of the property.
@Lydia_Pintscher yup that's what I thought I'd do too .. I will open a topic on that constraint on the talk page. Thanks for following up with me on this!