Admin Access for Webform Entries
Webform for Drupal 8 allows you to give a role (or specific user) access to view and update submissions of a SPECIFIC webform to accomplish what you need

Goto Settings > Access of the webform in question and assign VIEW ANY SUBMISSIONS and  UPDATE ANY SUBMISSIONS to your Trusted user role



Than you have to give this user the URL to view and edit/update all the submissions.  For example for the contact form they should visit /admin/structure/webform/manage/CONTACT/results/submissions and they would be able to see all submissions and edit them.