Formatting a notification icon

Is there anyone that knows how this guy got a (1) to show at the inbox view header?

The text under the icon can be set dynamically by the Display name expression for the view associated with the icon:

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Thanks for the reply Steve. Will give it a try.

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Hai steve

Can you give me example the expression

For example:

  "Messages (",
      ([User] = USEREMAIL())
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i will try it

thank you for your quick respons steve

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Thank you steve…

but, can we give colour with bold text ?