Yes, as I mentioned above Wix Stores database will only be Read Only. This means you cannot add or edit fields. To add info you must use the actual Wix Store app. You can, however, create an additional database and create a reference field to then Wix Stores database. From there, you will be able to recreate your own pages. Just know that limitations will still exist. Meaning you can change or create new fields for the checkout process. To customize a Wix Stores app is best to hire a Corvid expert that understands its limitations.
P.s. If you do not want to code or thr project does not have the budget to hire an expert coder … know that there are other store apps that you can integrate or embed onto your Wix site … such as Ecwid.