There is! I use external-dns. [1]
I haven't actually set up a Let's Encrypt wildcard cert, but I'm pretty certain cert-manager [2] supports it. I don't think you need a proxy if you use the DNS01 challenges.
[1] https://github.com/kubernetes-sigs/external-dns/
[2] https://cert-manager.io/docs/
There is! I use external-dns. [1]
I haven't actually set up a Let's Encrypt wildcard cert, but I'm pretty certain cert-manager [2] supports it. I don't think you need a proxy if you use the DNS01 challenges.
[1] https://github.com/kubernetes-sigs/external-dns/
[2] https://cert-manager.io/docs/