It's not new; it's just something that you happen not to have come across before. It's a relatively commonplace technique, although technically tricky to pull off well, not least because each narrator needs to be interesting enough for the reader to spend time with. But books with multiple narrative viewpoints date back to at least The Woman in White by Wilkie Collins, published in 1859.
silverandamericard t1_ja7ay1t wrote
Reply to Question about chapters titled with a person's name and first person narrative. by Ginaccc
It's not new; it's just something that you happen not to have come across before. It's a relatively commonplace technique, although technically tricky to pull off well, not least because each narrator needs to be interesting enough for the reader to spend time with. But books with multiple narrative viewpoints date back to at least The Woman in White by Wilkie Collins, published in 1859.