search – Filtering Multi Value Taxonomy Managed Property against a Multi Value Query String Variable

When I use below line it works:

{|MultiValuedTaxManagedProperty:{Page.MultiValueTaxField}}

However I would like to do the same with a query string parameter:
URL?Param1=Value1;Value2;Value3

{|MultiValuedTaxManagedProperty:{QueryString.Param1}}

Am I using wrong format for Param1?