How to manually reserve subnet from /56 obtained with DHCPv6-PD?

I receive a /56 via DHCPv6-PD and OpenWrt then assigns a /64 of that to my LAN. Suppose I need to reserve another /64 from that prefix for use on an interface that can't use the automatic IPv6 handling, e.g. VPN. How would I notify OpenWrt that I am manually reserving a subnet? I suppose if it always assigns the first /64 to the LAN then it doesn't really matter as I can just pick any higher number. Any recommendations?

You can use ip6hint for a specific subnet on the managed interface:

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