libvmem1 binary package in Ubuntu Focal arm64

 The libvmem library turns a pool of persistent memory into a volatile memory
 pool, similar to the system heap but kept separate and with its own
 malloc-style API.
 .
 libvmem supports the traditional malloc/free interfaces on a memory mapped
 file. This allows the use of persistent memory as volatile memory, for cases
 where the pool of persistent memory is useful to an application, but when the
 application doesn’t need it to be persistent.

Source package