With optgroups mock data

id: select-optgroups
options:
  - type: option
    value: a
    label: Value a
  - type: option
    value: b
    label: Value b
  - type: optgroup
    label: Group a
    options:
      - type: option
        value: a1
        label: Value a1
      - type: option
        value: a2
        label: Value a2
  - type: optgroup
    label: Group b
    options:
      - type: option
        value: b1
        label: Value b1
      - type: option
        value: b2
        label: Value b2

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