Adding floating IP to VM after provisioning

I have 5 VMs up and running, but I want to do high availability among these 5 VMs. I know that you can add floating IP to VR (which I already have). But is there ways to add them AFTER provisioning?

This is a good feature, that we would like to implement:

It’s not possibble for the moment, but we would like to prioritize this for the next release.