My IPv4 setup is working fine clients connects to router and are all traffic is routed to it. I want to accomplish the same using IPv6 so client can reach IPv6 addresses from my router. Is it possible and how?

Did you manage to sort this out? Facing similar issue with L2TP connection to Mac OSX Mojave where IPv6 doesn't work.

No.

This doesn't work on MacOS because for some reason MacOS doesn't do SLAAC on ppp interfaces. People have created hack-ish workarounds like a script that does a packet capture to listen to for IPv6 router advertisements and then use that to set the IPv6 address, but that kinda workaround doesn't really scale. I haven't yet found an option that allows SLAAC to work properly on ppp interfaces.