Yes, the process of theosis or sanctification or deification (a danger word unless you know what it means properly which you do) is in the family of panentheism.
I’m not familiar with henosis as I’m not studied in plotinius or neoplatonist but I know of kenosis – self-emptying – which was a significant part of orthodox theology.. the seeming paradox of self-emptying that also allows the holy spirit to enter – the essence vs energies aspect of Orthodox theology.
The wikipedia for panentheism is surprisingly well done for the most part, at least in the parts that I was interested in. What I like about it as a stance, which I’m still not committed to — is that you can remove it and everything stays the same. But with it, everything is enriched. The relationship between god and universe in panentheism allows that kind of freedom.
It’s in the notion of “God is in every blade of grass”. Not the grass but in throughout and outside
Basically I want things that can cover a good portion of humanity’s ideas. Not the perfect or most correct or anything close to that. But something that’s broad enough to be a decent rosetta stone that’s transferrable.