Binding slices of maps and flags

[hacel]

So I have this config file:

people:
  - name: john
    age: 24
  - name: james
    age: 25
  - name: johnson
    age: 26

I can easily access this in code with people.0.name for example. I can even access this in env vars if I do cfg.SetEnvKeyReplacer(strings.NewReplacer(".", "_")) and then set PEOPLE_0_NAME=jason.
But how do I bind a flag to it? I imagine this would be something like --people.0.name jerome and --people.0.age 22 but I'm not sure if pflag supports this.