Each custom field plugin offers ‘Options pages’. Options pages are used to store global settings. These settings are not tied to a specific post, but are instead stored in the wp_options table. They can be used for site-wide fields such as Company Name, address, and registration number, for example. They could be used in the footer, policy pages and so in.

At present, they are only offered by the native form builders for each (ACF Form, JetFormBuilder, MetaBox forms). It would be great to add this as a feature. Mainly as for clients with low technical expertise and do not require WP admin access, a simple form could be added to the front end so they may make changes such as updating the company address due to a business relocation.