Properties
desktop
desktop: "default" | "all" | "mention" | "none"
email
email: "default" | "all" | "mention" | "none"
ignore_channel_mentions
ignore_channel_mentions: "default" | "off" | "on"
mark_unread
mark_unread: "all" | "mention"
push
push: "default" | "all" | "mention" | "none"