Sorry for the delay. I didn't think the actual hardware mattered, since this is the android version of Bookari. Anyway, this is a Samsung SM-T535.
As for the Colordict method: As far as I can tell, I can download specific dictionaries into Colordict, but not the ones I'm interested in.
Within Bookari, you can also access Google, Wikipedia and such, but I was looking for a method to leverage the dictionaries I already have on-board. I guess at this point, it's not possible.
If I misunderstood anything, I'd be grateful for a correction.
Thanks again to all