toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (audience != null) 'audience': audience!,
if (email != null) 'email': email!,
if (group != null) 'group': group!,
if (name != null) 'name': name!,
if (person != null) 'person': person!,
if (role != null) 'role': role!,
};