There is not a way to set the autocomplete attribute on the child elements of the Name composite element. Ideally, there would be an autocomplete field in the setting section of each child element.
autocomplete attribute.Implement an autocomplete field for each child element, in the settings section. The values of this field should be similar to those implemented in https://www.drupal.org/project/webform/issues/3113160.
Active
6.2
Code
You can set additional attributes in the source
name:
'#type': name
'#title': Name
'#title__autocomplete': 'This is an autocomplete attribute'
It is not feasible to support every attribute via the UI.
You can also create your own custom elements in code the supported any attribute