The Hollywood star, whose mother is Samoan, returns to his role as the beloved demigod Maui for the sequel to Disney's 2016 animated hit.
Set three years after the original film, Moana 2 will see Moana and Maui reunite for the new voyage alongside a crew of unlikely seafarers.
Dwayne Johnson has returned as the voice of Maui in Moana, eight years after the original film. (AP PHOTO)
Johnson told the PA news agency on the blue carpet of the film's UK premiere in central London: "I think it's critically important to be an advocate for representation and for culture.
"I can tell you, just by experience with Moana, it's been, not only an incredible experience, but also, I think, one that has brought me closer to my own culture."
The wrestler-turned movie star, 52, said he has realised every day can provide a "learning lesson" for your culture, despite how much you may already known or has been "embedded in your DNA".
"Every time I go back home to Hawaii or speak with my Samoan elders or call on my ancestors, you always learn so much", he added.
"So I think to be able to bring Moana 2 to the big screen and to have a lot of people around the world who anticipate the film is really a great thing.
"But also, I think, embracing not only our culture, our Polynesian culture, but also embracing their own culture too, as well."
Johnson, who his a "girl dad" of three daughters aged 23, eight and six, said one of the "greatest things" about the project was how his children can see themselves represented in Moana.
"It's also amazing when I go around the world to promote the film, like here in London, wherever I've been, you meet all these little girls around the world and little boys who see themselves, who are not brown skin, and it's beautiful, they see themselves in Moana and Maui, and it's amazing", he added.
He revealed another special aspect of the role for him was that his character Maui was "largely inspired" by his grandfather.
"So in a way, I speak as him and I'm in his skin", he said.
Hawaiian actress Auli'i Cravalho returns to voice the title character, who is set to embark on a new adventure through the far seas of Oceania and into dangerous waters after receiving an unexpected call from her ancestors.
Directed by David Derrick Jr, Jason Hand and Dana Ledoux Miller, the sequel will feature music by Grammy-winners Abigail Barlow, Emily Bear and Mark Mancina and Grammy nominee Opetaia Foa'i.
The original film followed the story of adventurous teenager Moana as she set sail on a daring mission to save her people, enlisting the help of the gregarious demi-god Maui.
It was nominated for two Oscars in the best animated feature and best original song categories.
The track How Far I'll Go, written for the film by Hamilton star Lin-Manuel Miranda, won the Grammy for best song written for visual media.
Moana 2 is set to be released in cinemas on November 29.
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