RelationDefaultContent

fun RelationDefaultContent(    @Json(name = "rel_type") type: String?,     @Json(name = "event_id") eventId: String?,     @Json(name = "m.in_reply_to") inReplyTo: ReplyToContent? = null,     @Json(name = "option") option: Int? = null,     @Json(name = "is_falling_back") isFallingBack: Boolean? = null)