ZSH auto completion for Pass: prompt sub level words (currently only prompt top level)

I installed https://git.zx2c4.com/password-store/tree/src/completion/pass.zsh-completion under /opt/homebrew/share/zsh-completions/pass.zsh-completion and enabled compinit in ~/.zshrc:

# define zsh-completion
if type brew &>/dev/null; then
    FPATH=$(brew --prefix)/share/zsh-completions:$FPATH

    autoload -Uz compinit
    compinit
fi

And the pass completion works, but only with top level word. For example I have misc/keycard. When I type pass show m[TAB], I can see misc prompted. But when I type pass show k[TAB], misc/keycard is not showing. Please instruct how to modify this completion file to enable partial regex match. Basically it's impractical to use right now; as I put passwords into dir to ease my memory; I will not remember the whole structure of dir tree.