How to enable notification text for "mi band connected", accu status and other?

For standard notifications of "normal" apps I can enable to show the text. But there are some special notifications (mi band is connected, accu is x %,...) where I get instead of a text the message that text transport for this app should be enabled, but I can't find how to enable. The menu for this special notifications is different from the "normal" menu. I can't enable to send the text.

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