Feature to add a custom field in key value format

Does RT or any plugin provides a feature to add key-value custom field
Example

  • Name of custom field : Service Identifier
  • Format : key → value
  • Can hold multiple key values
  • keys and values are arbitrary as entered by operator
  • Samples
    branch1_circuit_id → BC12879
    branch2_link_id → RTKOLL122
    customer_service_ref → 112233

Thanks