I have a text of pv value like { "user" = "ABC", "class" = "EFG",.....} this and i want this to store into cdt to the related names [ user : "ABC", class : "EFG"]
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I am not 100% clear with your question but it looks like you are trying to cast a text value to a CDT vaue. If yes, then you can use the below expression.
cast( typeof(type!yourCDT()), "value to cast" )