Hi Tomas,
Yes, it’s completely possible to host your webflow project under a subfolder rather than a subdomain!
Webflow doesn’t provide this functionality out of the box unless you’re an enterprise customer so you may have to find a different solution if you’re not an enterprise customer.
The term for the piece of software that can enable this kind of hosting is called a “reverse proxy server”. If you’re technical, one option is to setup a Cloudflare worker script that sits in front of your website and directs traffic based on your setup. A quick google can help you set this or any other reverse proxy server.
This can be a good solution but unless you know how to code, it can be hard to setup and maintain reliably. The other option you have is using a no code reverse proxy solution like Subfold.
Hope this helps!