Simple calculations with two or more metrics (sum, subtract, etc) with influxql/flux query?

is it possible to sum two or more metrics with influxql (or may be with flux) rather than stacking graphs or executing an expressions on them ?
For example - sum of two metrics: uplink and downlink traffic.
I.e. it possible to perform simple calculations on the metrics while retrieving them from database?
I mean something like a+b, b-c, (a+b+c)/(d+e+f).

Have you already tried using Transformations?

As i can see - transformations take the metric and perform calculations with it. But i can’t find a transformation which could do “metric1 + metric2” for example

Have you tried something like this?

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Thank you, Grant
Will check this.