When you look into OC10 /var/www/data/ and you cannot find any readable files, then it is probably due to encryption. Right.
oCIS does things differently. It uses the storage filesystem for something we call decomposedfs. When you look into /var/lib/ocis/storage/ then all you see is a database like structure with many subdirectory levels containing blobs and nodes, etc…
The official answer to your question is probably: No, only oCIS can parse its decomposedfs.
But you may try your luck with some bash script
here QA/tools/hetzner-deploy/bin/dump_decomposed.sh at master · owncloud/QA · GitHub
or some python script there GitHub - esgarov/ocis-storage-dumper