[sv-bc] Defparam on member of parameter struct

Hi,
In System Verilog, we can declare a paremeter as struct.

As per V2K LRM, a defparam can be applied on parameter only.

So can a defparam be applied on a member of struct param?

Is the following test case is valid?

module top;
    parameter struct {int x;} p = {1};
    defparam p.x = 1;
endmodule

Regards
Surya.