I think I understand What are u doing here.

The solution is easy you make something called DTO :

-stands for :"Data transmission object" -

lets say you have a class called Order and its like this

Public class Order {
    public string Name; 
    public string PromoCode ;
public int amount
}

and you want to show only name ,amount

then you make a DTO

Public class OrderDto {
    public string Name; 
    public int amount;
}

now what you should do is map the proprties you want from the order into the orderDto

and then return the orderDto serialize it to the java script