Para sacar info de un grupo (por ejemplo el chatID), metemos al bot @RawDataBot y nos dara un json con el siguiente formato:

<code>
{
    "update_id": 816025253,
    "message": {
        "message_id": 974009,
        "from": {
            "id": 4982505,
            "is_bot": false,
            "first_name": "I Want to be Freak",
            "username": "IWantToBeFreak"
        },
        "chat": {
            "id": -699088581,
            "title": "Jur123 group",
            "type": "group",
            "all_members_are_administrators": true
        },
        "date": 1638376574,
        "new_chat_participant": {
            "id": 211246197,
            "is_bot": true,
            "first_name": "Telegram Bot Raw",
            "username": "RawDataBot"
        },
        "new_chat_member": {
            "id": 211246197,
            "is_bot": true,
            "first_name": "Telegram Bot Raw",
            "username": "RawDataBot"
        },
        "new_chat_members": [
            {
                "id": 211246197,
                "is_bot": true,
                "first_name": "Telegram Bot Raw",
                "username": "RawDataBot"
            }
        ]
    }
}
</code>