Libbpf supports declarative pinning of maps, that's how you easily get
"map re-use" from BPF side. See [0] for example.

These examples are exactly what I am looking for but it appears that they either require BTF activated in the kernel or require a 5.8 kernel. Unfortunately I am targeting the new Ubuntu 20.04 system with "out-of-the-box" configurations. So that means I am saddled with kernel v5.4 and BTF not active. Why does libbpfs declarative map pinning require BTF? Does the metadata within BTF support the ability to correctly find and open the map?