FieldOptions object

Attribute	Type	Description	Applies To
`choices`	Array of Strings	All options that a user may select from a field.	`DropdownField` `RadioField` `MultiCheckboxField`
`allows_other_writein`	Boolean	Whether or not an `Other` choice is available that would requires the user to write in any string, in addition to the provided `choices`.	`RadioField`

// T-shirt size options
{ 
  "choices": ["Small", "Medium", "Large"],
  "allows_other_writein": true
}