How can I fetch accounts and contacts item data of an particular deals item

Hi Team,
I am creating an monday app where I am display some data on the app importing that from monday CRM. I am able to fetch all the details about the deals board but I wanted to fetch some of the accounts and contacts data that is related to a particular deal item.
Suppose we have deal1, deal2, deal3, and I want to fetch industry which is on the accounts board, how can I do this in my app using an easier way. I have used graphQL to get the data but its getting complicated as I dont have direct access to accounts and contacts of a particular item. Somehow I need to figure out the id of the accounts and contacts item to get the data.
Let me know how this can be achieved in an easier way possible.