change field that is displayed in relationship field dropdown

const Tag: CollectionConfig = {
  slug: 'tags',
  fields: [
    {
      name: 'product',
      type: 'relationship',
      relationTo: 'products',
      required: true,
    },
    {
      name: 'date_given_out',
      type: 'date',
      required: true,
    },
  ],
};
export default Tag

With this code, the dropdown will display the Id of my products. I want

to be displayed instead. I couldn't find in the documentation where to set this.