Hello @Abrar_23,
Thanks for contacting us again. Regarging your question, I cannot give you a recommendation on which chip to use. And as you know, I can only give you accurate information regarding the S32G chip, for that, I checked the LwIP examples we have, the are already configured to use IPv6, you can see that in the lwipopts.h file, by searching for LWIP_IPV6, which is already enabled, at least in the lwip_FreeRTOS_S32G274A_M7 sample program.
Although we do not offer examples to use IPv6, you can check the official LwIP documentation on how to configure it and use it, https://github.com/virtualsquare/view-os/blob/master/lwipv6/LWIPv6_Programming_Guide.
Let me know if this information helped you with your problem