How to perform property validation in conditional branches when the variable is an Object

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As shown in the image, the parameter data is an object, and the selected condition is “Yes”. How should the input value be written to validate that data.key1 = 1?

I did some research and found a solution: {{ variable_name.object_key }} == 'target_value', but it doesn’t seem to work.

Could you please advise, what should be entered as the “input value”?

What comes to mind is a complex judgment, handled with a code node beforehand :joy: