Where are the Rawang People in the Northeast?

I am curious about this ethnic group. Their closest relatives are the Dulong people of China and the Tarong People of Myanmar. Their language is a dialect of Nungish languages, which is different from other Tibeto-Burman languages ​​in the northeast and is closer to the Burmese and the Yi people of China. Are they distributed in Northeast India? What is the population?