Where to input transformation code? (Was: How to hide zero or null values in Legend in Grafana 8)

[grafanaclouddfdb]

Continuing the discussion from How to hide zero or null values in Legend in Grafana 8?:

@rmortyh

transformNull(-1) to turn all the nulls to -1 (or a value that works for you)
followed by
minimumAbove(-1)

@rmortyh thank you for the idea - where can I input these commands/code?
Is this related to thequery for your specific connector (I use Elasticsearch), or is it a Grafana post-processing code?

[grafanaclouddfdb]

I found it - it was quite obvious actually. This is the “Transform” tab