Time Series Chart help

I have a series of a query readying the temp and the timestamp. What I’m trying to add is a Tag to mark High Temp, for example. According to the request put to me, they want a horizontal line that could be changed. I see the line on examples but never how to do it. This is an example:

No need for a tag. You just need to create a plot and use the markers config to create that “high temp” line:

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