Hi Calle 

Thanks for following up on that topic! Unfortunately it's currently not possible to export our diagrams to .bpmn format. If you would like to see this feature implemented in the future please make sure to add your vote to this through our feature request form. We are continuously looking for how we can make our product more useful and effective for our users and we pass the ideas promoted via this form directly to our product development team for their consideration. 

While Lucidchart does not support the .bpmn format it allows you to export your documents to the following formats: PDF PNG JPEG SVG VDX (Visio) and CSVs of shape data. If any of those formats would be useful for you please take a look at our Export/Download Your Lucidchart Documents article from the Lucidchart Help Center. Hope this helps!