Indentured servitude is NOT chattel slavery. That's also not what pre-colonial Cherokee practiced, but it's a closer concept. It's a much longer oral explanation that I doubt you'd accept anyway.

I suggest you look up the definitions of both before equating the two. I'm partially Cherokee, and another part was a white man who was shipped to the American colonies as an indentured servant, under penalty of death. After 14 years he was free, purchased land, chose a wife, and had a family. That family wasn't born into slavery, the children weren't sold and shipped off as soon as they could be weaned from their mother's breast, and he was given all the rights that a white landowner could have in the 1700s. Someone sold into, or born into, chattel slavery could not do this. They were born, lived, and died at the mercy of their master.

There is a reason historians make a distinction. No, neither is acceptable. But chattel slavery was not practiced by native tribes prior to colonization.