Building Applescript ObjectSpecifier With Name in Javascript

Is there a way to build an ObjectSpecifier using name instead of array number in Javascript Applescript?

search = ObjectSpecifier().buttons["Add"].value

items = items.groups.whose({_match:[search,"Selected"]})

The index for "add button" is different in each item, so if I build the ObjectSpecifier with buttons[3] Instead of buttons["Add"], it only returns the

items that have add button at the index 3. I also tried "ObjectSpecifier().buttons.byName("Add").value", but it doesn't work.

Thanks!!!