The name of an existing field definition to assign to the template. Required.
OptionalisWhether the field is required for entries assigned to this template specifically. Distinct from the repository-level IsRequired on the field definition.
OptionallocalThe per-template description for this field assignment. Distinct from the field definition's repository-level description.
OptionalpositionThe 1-based position at which to insert the field. Omit (or set null) to append to the end of the template. Values less than 1 or greater than the current field count + 1 are rejected with 400.
Request body for adding an existing field definition to a template.