IPv6 prefix delegation configuration on Chateau 5G AX

I have a Chateau 5G AX that connects to the internet through an LTE interface. The LTE interface has obtained an IPv4 address and also acquired a /64 IPv6 address.
What I want to know is how to configure it to obtain a ::/64 prefix address range and distribute these IPv6 addresses to the internal network that uses the LTE interface for internet access.
(What I already know is: 1. When I use my Android phone as a hotspot and share the network with other devices, they can obtain IPv6 addresses distributed by the Android phone; 2. I have a 5G wireless router running OpenWRT system that can also distribute the IPv6 addresses obtained from the LTE interface to the internal network.)

You might look at the ipv6-interface property of the APN profile:

ipv6-interface (; Default: ) Interface on which to advertise IPv6 prefix

Thank you. Following your tips, I solved the problem.