I configured a Juniper SRX firewall to receive IPv6 prefix from upstream router:

        family inet6 {
            dhcpv6-client {
                client-type statefull;
                client-ia-type ia-pd;
                update-router-advertisement {
                    interface vlan.20;
                    interface vlan.30;
                    interface vlan.40;
                client-identifier duid-type duid-ll;
                req-option dns-server;
                req-option domain;

Received IPv6 prefix is a /56 address pool

Client IP Prefix:             xxxx:xxxx:xxxx:x000::/56

For vlan.20. vlan.30 and vlan.40, I need to further subnet the received prefix to /64. Is there anyway to do this?

BTW: In Cisco equipment, the above task can be done with

ipv6 address prefix-from-provider 0:0:0:01::/64 eui-64

at interface configuration.

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