DefectDojo parser accepts Burp Issue data as an .xml file.
To parse an HTML file instead, use this method: https://documentation.defectdojo.com/integrations/parsers/file/burp_enterprise/
When the Burp report is generated, the recommended option is Base64
encoding both the request and response fields - e.g. check the box
that says "Base64-encode requests and responses". These fields will be
processed and made available in the 'Finding View' page.
See also: Burp documentation - XML export is described under “Export Issue data”. https://portswigger.net/burp/documentation/enterprise/work-with-scan-results/generate-reports