[Chisel] Casting integer type

Want I want to do

I want to expand a chisel.UInt type variable defined in 32bit to 64bit.

What is impossible

First, the following will result in a compile error

val x = 1.U(32.W)
val y = x.asUInt(64.W)

Official site also says it is not possible to cast to widen the bit width.

From hardware point of view, it seems that it is not possible to suddenly add more lines to a 32-bit bus.

How to solve

So what to do is to substitute a 32-bit value into the 64-bit value prepared in advance.

val op1_data = 1.U(32.W)
var op1_64 = UInt(64.W);
op1_64 = op1_data;

I don't know if this is the officially recommended method;