oltrexr4 - Hi, I am not able to understand the ...

Hi, I am not able to understand the right syntax of the input variable within a node, example: I have two nodes, the first one retrieve a row from a supabase table, the node is called GetDetails, the return json is an array of one json object, in the second node I need as input a specific element of the json, I have tried several syntax but no one is working, I understood that I need to use the {}GetDetails output but after? I have tried {}GetDetails.plate, not working, {}GetDetails.item[0].plate not working, {}GetDetails.item.0.plate not working.
In this specific case AI is totally useless ... thanks for your help