The efile is an XML file, so yes. But you can't specify "give me this information in an XLM format," if that's what you're hoping for.

There is an SDK you wouldn't know to look for. Here:

https://developer.intuit.com/app/developer/lacerte-sdk/docs/lacerte-get-started

There is even a user group, here:

https://proconnect.intuit.com/community/lacerte-sdk-group/gp-p/501

Since we don't know your use case, these resources should be helpful.