Possible solutions

Use Option<Vec<(String, Vec<String>)>>>

The problem is that NAPI-RS so far doesn't support tuples

Define a temporary struct like

pub struct AliasItem {
  pub name: String,
  pub paths: Vec<String>,
}

and write Option<Vec<AliasItem>>>.

I personally prefer using tuples on this case. However this requires discussing with NAPI-RS if this feature is really needed.