Apply transformation to fetch data before datastore processing

[sdalu]

Summary
I need to apply a transformation on the API endpoint (can't modify the backend for that) to make the result compatible wtih
the protocol used in readData

      data: {
        api: {
          readData: { url: '/api/1/devices', method: 'GET' }
        }
      }

Is there a way to specify a function to apply to the data returned by the url, before it is processed by the datastore ?

Version
4.21.22