Nope.
It's a wish, a hope and a dream of every tablet owner that upgrading ram could be as easy as on a laptop or desktop.
But these little buggers are a one time creation.
Best you can do is add memory card (SD, micro SD) to explains STORAGE, not ram. Apples to oranges.
Maybe some company will see the potential and create an upgradable tablet.
But cost to produce that, for the limited amount of ppl who would take advantage of it, is not worthwhile.
Buy today for future proofing.
Go ram heavy.