How to use MVC Web api controller with out return model type, i.e like anonymous

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MVC5

public IEnumerable<Prtl_Users_Chrt_Data> Get(int controlObjId)
     {
         
         return db.Database.SqlQuery<Prtl_Users_Chrt_Data>(StoredProcedure).ToList();

     }

The code a
bove is from the web api controller in MVC5.
For this code and stored procedure i know the output of the procedure would follow the model "Prtl_Users_Chrt_Data", so i am giving it as the type. How to call and execute a stored procedure in the similar way with out giving the return model name some thing like anonymous?