In our drupal 7 site I have multiple social link fields (links) that I would like to combine into a single "social_links" link type field. How do I do that in a custom d7 to d8 migration? I've tried multiple ways with no success.
Essentially I have something like this, but I want other source link fields to be added to field_soc_link_m:
(snipped from the migration yaml file) field_soc_link_m: plugin: sub_process source: field_linkedin (I want source fields: field_twitter, field_instagram, etc added) process: uri: url title: title options: attributes