Post with Virtual Assistant

I am trying to add Permission Sets to a user with a flow app. I have learnt that it is calling post call to fetch the obj key and then it calls a batch call ‘ApplyChanges’ and sends a payload, Can any one let me know please which values should I add to the Input PermissionSets here?

Hi,

Looking in the debugger it’s a key value string. Generate variable using Flow script and select it as input.