Complete JSON web service result set available during runtime?

Hi community,
use case: request 1-x product IDs from an external web service (JSON response, every product ID is comma separated) and list them in a select element on a survey as choices. All this should be done - of cause - during runtime of the survey, so the web service must be triggered in the survey flow, a workflow seems not be possible since it can only start after a submission at defined times.
Currently I'm just able to fetch the result set one by one:
And add it one by one to embedded data variables:
The JSON looks like this:

By saying this you can see that this is really limited in terms to a fixed number of elements. So, if a new product will be part of the result set, I must add it to the embedded data by hand.
So, the question is: do you see a possibility to add the whole result set (most likely as JSON text) to an embedded data variable in order to trace through it by the help of Javascript later?