I have a domain with third party that I would like to move to cloudflare, but I want to use them purely as registrar (and use Route 53 to manage DNS). Is this possible to do?

With my old registrar I have the nameservers set to aws and that just does it. In cloudflare, I don’t see an option of editing nameservers. I want to make sure I’ll be able to do this when I transfer. How do I use cloudflare just as a registrar?