Webhook Automation - Get query key

Configuration
1

I have defined an Webhook automation that responds to:
https://example.com/api/webhook/foo

I want to keep it simple and just append a query-parameter key to the end like this:
https://example.com/api/webhook/foo?on
https://example.com/api/webhook/foo?off

I can get the key and value (which is empty) from trigger.query

But how do I extract the key-part (in this case on or off) to use in a condition?

2 
{{ "on" in trigger.query }}
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