secureJson in backend plugin go

I’m developing a backend plugin with your sdk in go.
In the Data-source’s setting there is an example field : “API Key” secure json field (backend only)
I want to use some secure field like that which are accessible only in backend but how can i get this secure data in my backend file in go ?

Can some one give me some code/example to access this secure json data ?

Here the default ConfigEditor.tsx file which save the data, but I’m not able to get it in my go file

I don’t find any examples on the web …
However as we can see in the plugin base, this must be able to be done