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Have a look at https://github.com/ScalaWilliam/xs4s - I've used is successfully just couple of months ago.
I would look closely at xml-spac. Its whole point is streaming of tree structures, and it supports both XML and JSON. It also lives within the "purely functional Scala" ecosystem, which means that it relies on underlying Typelevel libraries, avoids the "kitchen sink framework" problem (e.g. Spark), tries to make types as representative of what's going on as possible.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.