This feature is probably the easiest feature that can be added to Webflow.

Ads.txt specifies a mechanism for publishers to list their authorized digital sellers, if you are planing to monetize your website with display and or native ads it is mandatory to have an ads.txt file in the root level of your domain.

Currently the only workaround for this issue is to buy a 3rd party hosting and redirect domain-example.com/ads.txt to a new subdomain that is hosted with a 3rd party web hosting company - subdomain.domain-example.com/ads.txt.

Please add this feature ASAP.