As mentioned by pinkunicorn "this is a limitation of Geocaching API -- they do not list which lab caches was hidden by whom so they are not visible in the hidden tab either".
So I think we have to wait until GC HQ is including Labcaches into GC.com. With this a Labcache included it would (could) be possible to get all the information with the GC-PGC API interface as long as Geocaching HQ do provide PGC with that information via the API.
Then PCG can do all the statistics like, hidden,, owner, country etc etc.
So we perhaps have to wait some more month. As we see hundres of new labs right now, Labcaches gets more and more a "normal" cachetype.:
"Geocaching President Bryan Roth just said on the Geocaching Vlogger's Youtube Gathering from July 15th that Adventure Labs will likely be on the Geocaching.com site by the end of this year. https://www.youtube.com/watch?v=BGrUMEpSfF8 "