jobExtendedProperty() values as dynamic url Send Web Request input

[RyanDickinson1]

Has anyone been successful in using a job extended property to populate the url for a send web request step? Doesn't seem to work using it directly as the url:

Use case is a GIS analyst needs to update a definition query on a service. Analyst would use survey123 to enter the url and the new definition query. Using rest api, call remove from definition then add the new definition.

I did notice in the documentation that the step should only be configured to trusted sources.