It's not impossible, but the mainstream theories such as 'Out of Africa' and most anthropological evidence suggests that the flow was from Africa to Indonesia and Africa to Europe, and not "back from Indonesia". But see https://en.wikipedia.org/wiki/History_of_Indonesia and https://en.wikipedia.org/wiki/Polynesia#History and https://www.nytimes.com/2020/07/08/science/polynesian-ancest... as well as https://en.wikipedia.org/wiki/Multiregional_origin_of_modern...

Europe is mostly believed to have been settled via Africa, the Middle East, and Western Asia. https://en.wikipedia.org/wiki/Genetic_history_of_Europe

(I am absolutely amazed by all the various humanity and technology origins. It's almost as if there is a direct path from the first person who used teeth and fingernails to pry a rock and fiber to make a spear to kill an animal and use its bones to make high quality tools for knapping stone, all the way to the lathe, which was the tool that bootstrapped the industrial revolution).