Is it possible for zen meditation or yoga to cure high blood pressure?

Hypertension : Help yes, cure not likely.

↑ed BP is a behavior: thus changes in the internal driver(s) of the behavior will likely change the behavior itself. Study https://www.healthtap.com/#user_questions/1577404, especially my comment, to understand mechanism of BP control. As embodied Soul↔Mind↔Brain↔Body creatures, anything which calms drivers of ↑ed TPR, e.g. feelings of anger, frustration (sometimes fear) & Déjà vu internalized triggers will also ↓BP.