Previewing the title in a string options list in Sanity and the front-end.

//studio/schemas/objects/projectMember.js

export default {
  type: 'object',
  name: 'projectMember',
  title: 'Project Member',
  fields: [
    {
      title: 'Person',
      name: 'person',
      type: 'reference',
      to: {type: 'person'}
    },
    {
      title: 'Roles',
      name: 'roles',
      type: 'array',
      of: [{type: 'string'}],
      options: {
        layout: 'radio',
        list: [
          {title: 'Content Designer', value: 'content'},
          {title: 'Director', value: 'director'},
          {title: 'Engineer', value: 'engineer'},
          {title: 'Engineering Manager', value: 'engineeringManager'},
          {title: 'Product Designer', value: 'designer'},
          {title: 'Product Manager', value: 'manager'},
          {title: 'Subject Matter Expert', value: 'sme'},
          {title: 'Technical Writer', value: 'technicalWriter'},
          {title: 'UX Researcher', value: 'researcher'}
        ]
      }
    }
  ],
  preview: {
    select: {
      personName: 'person.name',
      roles: 'roles',
      media: 'person.image'
    },
    prepare (data) {
      return {
        ...data,
        title: data.personName,
        subtitle: data.roles && data.roles.join('/')
      }
    }
  }
}