Custom objects should be able to defined in the HubSpot interface, without the need for a developer using the Custom Object definition API
I agree that this would be nice, but in the meantime, here’s a post I wrote on: How to Create Custom Objects in Hubspot Without Coding
I hope it helps
https://www.auxilio.io/en/help/how-to-create-custom-objects-in-hubspot-without-coding
Hello, our developers have built an app to visually manage the custom object creation, deletion, etc.
It’s completely free and it’s available here: HubSpot Marketplace