Nope cannot directly,you will have to explicitly map to XCBL document from scratch same you did for PIDX documment with appropriate transformation,rules,loops etc…Since each of its nodes,recursive loops tags varies by doctype.Even if possible it will be a tedious work.
It’s been my experience with standards that, even though they are standards, everyone usually uses them slightly differently. Given the semantic differences, I’d think it would be nearly impossible to create a general-purpose transformation from one format to another that works in multiple cases.