Source:

public value class Val {
    int x;
    public Val(int x) { this.x = x; }
}

javap output:

Compiled from "Val.java"
public final value class Val {
  final int x;
  public static Val Val(int);
}

Or, with -verbose:

  public static Val Val(int);
    descriptor: (I)LVal;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=2, args_size=1
         0: aconst_init #1 // class Val
         3: astore_1
         4: iload_0
         5: aload_1
         6: swap
         7: withfield #3 // Field x:I
        10: astore_1
        11: aload_1
        12: areturn
      LineNumberTable:
        line 3: 0

I don't love the precedent that javap turns "<init>" into a source-like constructor declaration, but as long as we're doing so, we should do the same with "<vnew>", and make the signature look like the source:

Compiled from "Val.java"
public final value class Val {
  final int x;
  public Val(int);
}

(No 'static', since source-level constructors can't be 'static', and no return type.)