IPv6 support must be consistent and easy
IPv6 was designed for the minimum configuration and maximum flexibility. No NAT, flexible load balancing.
It's 2019 here but IPv6 support in Azure leaves much to be desired.
Specifically, do you want us to "request an IPv6 address" and "assign to the load balancer"? Really?
The main principle of IPv6 is to issue the minimum of /64 block.
The block must be assigned to the LB (router) and the prefix along with RDNSS must be announced using multicast.
VMs must have global IPv6 connectivity.
LB must have a unicast address.
Azure is intended for the service and application development, not a "button clickers". Show some respect to the admins and developers and do what's right.