Action for ACR white balance eyedropper that selects the entire image area

The standard auto white balance command of the CRF can be scripted:

/*
CRF - Camera Raw Filter Auto White Balance.jsx
v1.0 - 8th February 2024, Stephen Marsh
https://community.adobe.com/t5/photoshop-ecosystem-bugs/acr-auto-white-balance-action-makes-the-same-change-every-time/idc-p/14409202
*/

#target photoshop

var actDesc = new ActionDescriptor();
var idWBal = charIDToTypeID( "WBal" );
var idauto = stringIDToTypeID( "auto" );
actDesc.putEnumerated( idWBal, idWBal, idauto );
executeAction( stringIDToTypeID("Adobe Camera Raw Filter"), actDesc, DialogModes.NO );

That tutorial is for rendered images in the Camera Raw Filter, which is not exactly the same as Adobe Camera Raw.

I just tested and the script output records the absolute white balance result, not the selection. So If this is possible to automate in the CRF it isn't going to be the same process as manually using the eyedropper to "select all" with a marquee.

The white balance eyedropper is usually best set against something white or neutral, not by selecting the entire image (YMMV).