This mantra is particularly linked to the 4-armed Shadakshari form of Avalokiteśvara. The Dalai Lama is alleged to get an incarnation of Avalokiteshvara, and And so the mantra is very revered by his devotees. Chinese esoteric Buddhist follow was based upon deity yoga as well as the "a few mysteries": https://vashikaran-totke22221.educationalimpactblog.com/53171920/new-step-by-step-map-for-mantra