How to run cgexec without sudo as current user on Ubuntu 22.04 with cgroups v2, failing with "cgroup change of group failed"?

I've tried the procedures from:

• Cgroups error: cgroup change of group failed
• How to use cgroup in ubuntu 13.04
• https://unix.stackexchange.com/questions/197718/does-managing-cgroups-require-root-access

but they don't work on Ubuntu 22.04, presumably because of the update to cgroups v2:

sudo cgcreate -a $USER:$USER -g memory:myGroup -t $USER:$USERsudo cgset -r memory.max=500M myGroupsudo cgset -r memory.swap.max=0 myGroupcgexec -g memory:myGroup id

fails with:

cgroup change of group failed

It works if I run with sudo

sudo cgexec -g memory:myGroup id

but then the command runs as root, and I want it to run as the current user instead.