Solution
Using
LabVIEW NXG Web Module, you can easily retrieve data from any Web Service (both third party and LabVIEW) in a WebVI.
You can refer to
Call a LabVIEW Web Service shipping example in LabVIEW NXG.
You can also find an additional example on how to call a LabVIEW Web Service from a WebVI on
GitHub.