Hi
I found Releases · ufna/VaRest · GitHub which looks really nice. [Plugin] Http/s REST, blueprintable JSON and Parse REST API manager at once (VaRest) - C++ - Unreal Engine Forums
It makes accessing rest Apis possible with nested json. However it seems that it is up to ufna for controlling compatibility and updates which seems a bit rough on him. The functionality would come in really handy in visualization cases.
Question is if epic is going to make this functionality available for blueprints any time soon?