I don’t think you can ever get a good import from Pingendo to WP. You might consider trying the WP Gutenberg plugin instead of Pingendo. Unfortunately it is still very early in the development cycle, so does not currently work that well. It will get better and eventually become part of WP core.

Probably the best you can do for Pingendo compatibility is save the generated files to your server outside of WP, then redirect to them from a WP page using a custom template to do the redirect.