Allow HR Admin to include an attachment as a content in performance template

We want to allow HR Admins to include an attachment as a content in performance templates to be available for all employees to review in their performance document during their evaluation.

The attachment section in the performance document page doesn't satisfy our need as it only allows employees and managers to add attachments and we want to include the attachment in all performance document for all employees it will be time-consuming if we added them one by one for each employee.

How can we achieve this?