DNS Times from XML data from wpt_batch.py

Has anyone found a way to pull the DNS timing information from the XML files made from wpt_batch.py or any XML generated by a WPT test? I’m finding many of the other metrics that make up the waterfall but not this one…

I’m only interested in the root request to my domain and not any objects on CDN or third party. TTFB is filtered in this way… and only for the root request.

The only thing I can find related to DNS is the test location resolver.

How can I get DNS times for my root request from the XML data? ( or make it show up as a metric in the XML data )