Unfortunately, we cannot download file MonoLisa-Plus-1.808-otf.zip automatically.
Please go to https://blobs.brkn.lol/private/fonts/MonoLisa-Plus-1.808-otf.zip to download it yourself, and add it to the Nix store
using either
  nix-store --add-fixed sha256 MonoLisa-Plus-1.808-otf.zip
or
  nix-prefetch-url --type sha256 file:///path/to/MonoLisa-Plus-1.808-otf.zip