Use data from urls as the suggested values of a multivalue control
How to get started
Visual Studio Team Services
Navigate to your work item form customization page and add a rest multivalue control.
Edit the control so it can use the right field to store your selection and the right url/property combination to be displayed. For example
How to query
The selected values are stored in a semicolon separated format. To search for items that have a specific value use the "Contains Words" operator. If searching for multiple values, use multipe "Contains Words" clauses for that field.
You can also learn how to build your own custom control extension for the work item form here.