I’m trying to create my own GObject for use in a ListView

pub mod custom_widget {
    mod imp {
        use std::cell::OnceCell;
        use std::rc::Rc;
        use gtk::glib;
        use gtk::glib::{Properties};
        use gtk::glib::property::{Property};
        use gtk::prelude::*;
        use gtk::subclass::prelude::*;


        #[derive(Properties)]
        #[properties(wrapper_type = super::PointWidget)]
        pub struct PointWidget_{
            #[property(get, set)]
            name: OnceCell<Rc<str>>,
        }

        #[glib::object_subclass]
        impl ObjectSubclass for PointWidget_ {
            const NAME: &'static str = "PointWidget";
            type Type = super::PointWidget;

            fn new() -> Self {
                Self {name: OnceCell::new()}
            }
        }
        #[glib::derived_properties]
        impl ObjectImpl for PointWidget_ {}
    }

    use std::rc::Rc;
    use gtk::glib;
    use gtk::prelude::ObjectExt;
    use gtk::subclass::prelude::ObjectImpl;

    glib::wrapper! {
        pub struct PointWidget(ObjectSubclass<imp::PointWidget_>);
    }
    impl PointWidget {

        pub fn new(name: Rc<str>) -> Self {

            let struct_: PointWidget = glib::Object::builder()
                .property("name", name)
                .build();
            struct_
        }
        pub fn get_name(&self) -> &str {
            self.property("name")
        }
    }
}

But when I try to compile the code, I get the following error

error[E0277]: the trait bound OnceCell<Rc<str>>: gtk4::glib::property::Property is not satisfied

|

105 | #[property(get, set)]
| ^ the trait gtk4::glib::property::Property is not implemented for OnceCell<Rc<str>>
|
= help: the trait gtk4::glib::property::Property is implemented for OnceCell<T>

How can I create my own type that implements the gtk4::glib::property::Property trait?

Tried to implement my own structure

#[derive(ValueDelegate)]
        pub struct MyStruct(Rc<str>);

#[derive(Properties)]
        #[properties(wrapper_type = super::PointWidget)]
        pub struct PointWidget_{
            #[property(get, set)]
            name: OnceCell<MyStruct>,
        }

This resulted in the following error

error[E0277]: the trait bound Rc<str>: FromValue<'a> is not satisfied

|

101 | #[derive(ValueDelegate)]
| ^^^^^^^^^^^^^ the trait FromValue<'a> is not implemented for Rc<str>
|
= help: the following other types implement trait FromValue<'a>:
<bool as FromValue<‘a>>
<char as FromValue<‘a>>
<i8 as FromValue<‘a>>
<i32 as FromValue<‘a>>
<i64 as FromValue<‘a>>
<u8 as FromValue<‘a>>
<u32 as FromValue<‘a>>
<u64 as FromValue<‘a>>
and 1572 others
= note: this error originates in the derive macro ValueDelegate (in Nightly builds, run with -Z macro-backtrace for more info)

This works with Box, but I want to avoid unnecessary memory allocation because… I’m storing the data in a separate structure.

Any advice would be much appreciated.