Migration into Fujian throughout history

Can we know much, in specifics, about migratory patterns into Fujian, dating far back in history?

Are modern-day Fujianese/Taiwanese considered to have a strong anthropological ‘composition’ more closely akin to Southeast Asian peoples, than to the Han-Chinese ( while nevertheless being an admixture of the two strains, in likelihood [?] ) ?

Thanks for any feedback.

Chimp