Passing a Function through an Object

[TheBrenny]

I'm no Rust guy, so I'm having trouble building this (object) struct to allow for Functions to be included. I'm essentially exposing a way for a Window to be created from NodeJS using the Wry Rust library. This library has a way to attach handlers to certain events, and I'm really struggling to figure out how to pass a function in an object from JS to Rust:

#[napi(js_name = "WebViewSettings", object)]
pub struct NodeWebViewSettings {
    pub title: Option<String>,
    pub size: Option<Size>,
    pub position: Option<Position>,
    pub newWindowRequestHandler: Option<JsFunction>, // This
}

I feel like I've tried everything, but I actually don't know if I have. I've tried using a generic (<F> where F: Fn(String) -> bool), both upper and lowercase functions (Option<Fn(String) -> bool> and Option<fn(String) -> bool)>) with the uppercase requiring the dyn keyword and me looping back to "wtf is going on", and the lowercase claiming that Option<fn(String) -> bool> needs to implement ToNapiValue (which it does already, doesn't it?).

It's important that every field is an Option because that's how I'm maintaining that all fields are optional, but I have a feeling that the Options aren't the problem here...

I feel stuck and I don't know how to fix this issue...