Sandeep, why not CWP Developers stop being careless about IPv6 for so long and implement it definitely instead of giving excuses like this to adjust the template.
It is unthinkable that already 2021 there is still NO full IPv6 support for CWP and developers are not barely concerned about it treating it like: "Just edit template manually. We will add when we fell like."
The chap is paying CWP Pro in order to support it. I have paid in the past expecting for it to have IPv6 soon and it seems that probably the developers don't have a vaugue idea of what Ipv6 means in this context always leaving it for later.
Some people from the community already developed something to get this working within CWP and but developers didn't take that work into consideration to use something that has already been done.
What a shame this has been treated like this until now ! Seems we will not see full IPv6 in CWP in 2021 as well.