I created a custom field x_studio_project_name (char) in the crm.lead model. This field will be filled in there and should be replicated across all other Odoo 17 modules

I can find and add this field in the "Sales" and "Subscription" model but I can't find a way to add it into other models (like Purchase, Inventory, ...).

What can I do to get this field across whole Odoo, please?

Thanks!