Compount arithmetic expressions

Hi all,

In an alert I need to write an expression equivalent to
($insMean > 84) && ($insMean < 90)

In this case insMean is a reduce expression.

The only solution I can think of is (some kind of PromQL approach)
($insMean > 84) < 90

But it seems it is not returning what I expect. Any advise will be appreciated.