How can I enable IPv6 when microk8s is already installed?

I’ve read this article about enabling IPv6 on microk8s, but the documentation only talks about how to apply the configuration before you install microk8s; I installed it during the setup of my Ubuntu Server.

I’d like to know how to enable IPv6 after microk8s has been installed. The default installation settings work fine for me, so I don’t need to change anything except IPv6_SUPPORT: true (I don’t know if the parameters IPv6_CLUSTER_CIDR and IPv6_SERVICE_CIDR need to be included and manually configured or if they are automagically configured).