Creating an Org Chart from 1k Companies: Seeking API Solutions

Hey everyone! I have a list of 1k or so companies all of which have 50 or less people at them. In one of the columns I would like to pull a list of all of the people and job titles at each company so I can run an AI formula to create an org chart based on job titles. Is there a way that does use credits to pull all of the contacts at a company? Was messing around with potentially using HTTP API with Apollo but not sure if that is the best route.