1) As same description states "The label will appear in the dropdown list, and the associated value will be used as the value passed to the option." hence the correct format is label:value
2) limitations and automation example for Option Values feature
1) As same description states "The label will appear in the dropdown list, and the associated value will be used as the value passed to the option." hence the correct format is label:value
2) limitations and automation example for Option Values feature