How to setup the text of an alert in Kibana?

I have a question which I cannot find the answer for in docs:
How t setup the text of an alert in Kibana?

In above image, you can see some alerts from my rules. I'd like to change the text of the reason field to something else, like:
"No messages in the last 1hr for ....".
Also, I would need to access some fields of the document that the rule is based off. The rule is of "logs threshold" type.
Is this possible?

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