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As far as I know, this feature -How-to-Enable-Auto-Fill-Feature-Save-Form-Entries-to-Continue-Later
will only work for regular fields in the form but NOT on the widget's type of fields.
Unfortunately, this is a limitation where the autofill feature will work.
A workaround you can do is to force users to submit the form as soon as possible (make form shorter/simpler) so that you will be able to capture the needed data via submissions.
Hope this help. Inform us if you need furtehr assistance.