I am opening this as both a feature request, and as documentation, because it's been now at least twice that I saw this being asked by newcomers on Gitter.
The current way to be importing D7 views post-installation, is to be using the contrib module https://github.com/backdrop-contrib/default_views_config to convert exported D7 views into config, and then to import those into Backdrop via /admin/config/development/configuration/single/import.
With all the expected D7 sites upgrading to Backdrop over the next couple of years, we should make it easier to do that in core (we could remove that in Backdrop 2.0).
At the very least, we should make sure that the process of using the contrib module is documented in a place where people would expect to find it. Perhaps even consider a help message in Views, pointing to the contrib solution + online documentation.
Recent comments
I think maybe the problem is with CKEditor stripping the tags - it can be more aggressive than what you would expect from the text format settings. I copied your examples into an example page...
Specific tags to work in CKEditor 5
This saved my day, exactly what I had cooked up but I could not find the necessary settings. Thanks a bundle :)
How to relate one view to different nodes?
Welcome to Backdrop and I'm glad you are enjoying using it. If you need help feel free to posts questions in the 'How-To and Troubleshooting' thread.
Hello - Glad to met Backdrop