How to set Cusom Field Checkboxes Checked by Default on new Subscriptions

How to set Cusom Field Checkboxes Checked by Default on new Subscriptions

We've imported some checkboxes from Zoho CRM, where they are checked by default.

Now we want to use same fields in an another list not linked to CRM yet, and want that these boxes are checked by default too on initial subscription.

Thank you for help.