OpenApi import does not add BASE_URL to URLs

I am trying to import an OpenApi v3.0.4 document. The requests are all just “/api/…” instead of something like “{{BASE_URL}}/api/…”. This way I will manually have to edit all the URLs.

For context, the document is created by an asp.net core application with Swashbuckle.AspNetCore 10.2.3.