matrix-doc/event-schemas/examples/invite_room_state.json

[
    {
        "type": "m.room.name",
        "sender": "@bob:example.org",
        "state_key": "",
        "content": {
            "name": "Example Room"
        }
    },
    {
        "type": "m.room.join_rules",
        "sender": "@bob:example.org",
        "state_key": "",
        "content": {
            "join_rule": "invite"
        }
    }
]