How to add custom object filed into custom incident workspace

Summary

How to add custom object filed into custom incident workspace

Content

i have created a custom object and made relationship with Incident table, deployed the object but when i am trying to add these fields into Custom incident Workspace, fields are not coming into insert field section.

we have 200+ fields which we need to capture from different sources, and all of them will be related to contact or incidents, i am trying to avoid system attribute because it will be difficult to organize.

is their any way to add custom object fields into incident and contact workspace ?