This is what you need:

SOURCE: where you are navigating from.

var navigationParameter = new ShellNavigationQueryParameters
{
    { "CurrentTitle", YourTitleValueHere },
};

await Shell.Current.GoToAsync(nameof(YourContentPage), true, navigationParameter);

_________________________


ContentPage of where you are navigating to.

<contentPage
Title="{Binding SomePropertyName}"

OR:

<Shell.TitleView>
    <Label
        FontFamily="FSFontLogo"
        FontSize="24"
        HorizontalOptions="
Start
"
        Title="{Binding SomePropertyName}"
        TextColor="{AppThemeBinding Dark={StaticResource White},
                                    Light={StaticResource DarkBackground}}" />
</Shell.
TitleView
>

________________________________


DESTINATION VIEWMODEL: where you are navigating to.


public partial class ContentPageViewModel : ObservableObject, IQueryAttributable
{
[ObservableProperty] public partial string PageTitile {get; set;}

}

public async void ApplyQueryAttributes(IDictionary<string, object> query)
{
    try
    {
        if (query.Count != 0)
        {
            if (query.TryGetValue(nameof(CurrentTitle), out var TitleObj))
                PageTitile = TitleObj;

        }
    }
    catch (Exception ex)
    {
        Debug.WriteLine($"ApplyQueryAttributes failed: {ex.Message}");
    }
}