Default IDs (if any) should be displayed in edit mode with readonly labels and without delete buttons.
If other identifiers are allowed, display 'Add identifier' button that creates a new row:
"Label" is an input (in edit mode), with 'use suggest' flag on
Value input has <format hint> as placeholder
A delete button allows removing the row
Additionally, write js code to:
dissallow duplicates for identifiers configured this way
validate the format for identifiers with format specified