Is it possible to use ' b-form-select ' for a ' optgroup ' from variable:

options: [
{ value: 'A', text: 'Option A' },
{ value: 'B', text: 'Option B' ,
children: [
{ value: 'BA', text: 'Option BA' },
{ value: 'BB', text: 'Option BB' }
]
}
],