Figgure out weater bot.getApi().getChatAdministrators(message->chat->id) is an administrator

[Beerlesklopfer]

Hello Community

to me there are two missing samples:

ONE:
InlineKeyboardButton::Ptr btn_joinGroup(new InlineKeyboardButton);
btn_joinGroup->text = "BlaBla";
btn_joinGroup->url = "https://t.me/BlaBlaBot?startgroup=settings";
btn_joinGroup->callbackData = "joinGroup";

This the one to join a grouo

TWO
How to figgure out wether the typing user is and admin an its ChatMember attributes

Any hints would be apreciated