You might be able to accomplish that using Airtable. (Airtable.com)
You can create the content using an Airtable webform, then by using Zapier as the go-between, have it create a Webflow C.M.S. entry and also promote it to “Live” at the same time (so it’s published).
Then a Airtable read-only view of the data can be accessed by using the URL of the read-only database contents
Such as this secure example: https://airtable.com/shrsgtZQj6RsQwp6F/tbl2bnWYsF57a1Oqe
This is a read-only view filtered In Airtable to only be one customer’s view of their data. This particular example is a Kanban view of some fictitious data, but there are different views possible of the same data (like a spreadsheet-looking database view).
Here is a grid-style view of the same data: https://airtable.com/shrI20OVJ720cu0wz/tbl2bnWYsF57a1Oqe
You can embed the Airtable view (read-only database view) in Webflow by using an embed (like a pop-up) to give that particular customer access to their data.
You can also password protect each customer’s view separately if needed.
As long as you don’t need to modify the data at some point, this should work fine, but I only have a broad idea of what you’re trying to do
Here is an example of embedding this into a Webflow pop-up (with the Airtable branding turned off)