Hi,
Thanks for contacting us and your interest in Nicepage.
You can use the hubspot forms in WordPress by adding the (hubspot) shortcodes with Position and Shortcode >> [ ] Shortcode to your Nicepage pages.
Please subscribe to our YouTube channel: http://youtube.com/nicepage?sub_confirmation=1
Follow us on Facebook: http://facebook.com/nicepageapp
If they allow you to export the html to import into Nicepage's html control, you should be able to.
I did it a while ago with a different form company when I first started.