Connecting CloudFlare to AWS NLB and Istio

Hi there! I'm looking to possibility to connect CloudFlare to enable WAF rules in my application. As far as I understand, CloudFlare works on DNS level, which means I have to change nameservers to let traffic go via CloudFlare instead of my current AWS Route 53. Am I right?

I'm also interesting in, is it possible to let Cloudflare manage traffic while using route53, but forwarding apply rules and forwarding rules to my NLB and Istio ingress gateway? Thanks!
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