Thank You for your response. I just made a comment since it was a list. I have definitely heard of Perumulmuragan for dalit literature…. tribal from central India, I am not sure very sure… Some links I found helpful were http://www.jayabhattacharjirose.com/dalit-literature-in-english/

https://lithub.com/11-books-to-read-if-you-want-to-understand-caste-in-india/

https://scroll.in/article/772558/the-tribal-world-strikes-back-at-indian-writing-in-english-through-a-doctor