optionId property
The ID of this dropdown option.
If you specify an ID, it must be unique among all options in this dropdown
definition. The ID must start with dropdownItem. and match regex
^dropdownItem\.[a-zA-Z0-9_-]{2,14}$ (length 15-27 chars). If you don't
specify an ID, a unique one is generated.
Implementation
core.String? optionId;