Display /64 subnet availability for larger IPv6 prefixes

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I am new to working with IPv6 addressing, from what I understand from various sources using a /64 subnet is the standard when creating new IPv6 networks especially when using automatic addressing. When creating prefixes for IPv6 networks I noticed that it displays the number of IPs, but not the number of possible /64 subnets. So if I want to setup a /56 prefix container I would like it to show the number of possible /64 networks available to me (256) and what percentage is available. Showing IP utilization in IPv4 networks makes a lot of sense, since IPv6 networks are so large it might make sense to illustrate the available network segments more than the IPs.

Example of the /64 recommendation:
https://www.ripe.net/about-us/press-centre/understanding-ip-addressing
In the article above they suggest that /48 and /56 are commonly distributed as a site allocation. From which you break down into the /64 networks that are needed.

Existing Information for prefix

Utilization 0%
Child IPs | 0
4.7 sextillion
First available IP | 2001::/56

Proposed information for prefix

IP Utilization 0%
Child IPs | 0
4.7 sextillion
First available IP | 2001::/56
/64 Subnet Utilization: 50%
Available /64 Subnets: 128

Curious if others might find something like this useful.