We are creating a react native app from our odoo db. We have 10 companies, and each company uses the project modules. Okay, we are providing the JSON RPC API for it. Now, the issue is that each company has its own unique custom fields. For example, some companies have 5 fields in the project form, but another one uses 10 fields. Now that we are creating an app for it, how will this form view be configured properly?

Each company has its own database. Multi Architecture means single code multiple database

Please help me with it. 

Thank you