NO2 are rapidly converted in NH4 and then to glutamate. NO2 is quite toxic.
To plants, fish and shrimp etc.
Small amounts might be taken up by plants, but does not last long.
It would be hard to track as a hobbyist.
Since the end and start products are typically NH4 and NO3, few bother with the intermediate step. Bacterial conversion is the only reason you'd have much NO2.
Still, you can see a significant NO2 spike if you add enough NH4(eg ADA AS cycling in a new ADA tank) and the NO2 does not go away(eg, the plants are not taking it up) and then to NO3 which does decline.