Further to what @alvpickmans and for use as a example I have used a JSON structured file as a intermediate file between software(image below of the JSON File as a preview). The whole process extracts the relevant data out of civils 3d relating to pipe networks then parses it into a JSON file. Then this file can be read in the Revit side to automatically create the geometry.
I would highlight that this was not done with any JSON standards relating to geometry(GeoJson).
Video: https://knowledge.autodesk.com/community/screencast/7a0bd93a-fe9b-446e-a4e7-43abcabe94e6