It would be ideal if an existing field layer template could be assigned to a document in a workflow. Currently one must run the workflow and remember to apply the correct template manually so that the signature fields appear. For example, a prefilled Purchase Order needs to be sent for two signatures that are applied automatically by the template prior to sending. Others have asked for this in the Community.

https://community.adobe.com/t5/adobe-sign/workflow-and-field-template-or-preview-and-add-signature-fields/td-p/10606517

https://community.adobe.com/t5/adobe-sign/automatically-assign-template-to-documents-for-signing/m-p/10703284