Centered Icon-only Tabs on Android

Hi,

I'm looking to remove the text from the tabs (and vertically center the icon) in my Xamarin Forms app, like this:

I achieved this on iOS by making the TextColor clear and shifting the image down:

    public override void ViewWillLayoutSubviews()
    {
        base.ViewWillLayoutSubviews();

        if (TabBar != null)
        {
            foreach (var item in TabBar.Items)
            {
                item.ImageInsets = new UIEdgeInsets(5, 0, -5, 0);
            }
        }
    }

Right now my tabs on Android look like this:

If it matters, it's been set it to the bottom of the screen like so:

    public MyTabbedPage()
    {
        On<Android>().SetToolbarPlacement(ToolbarPlacement.Bottom);
    }

How can I remove the text and center the icon on the Android tab bar? I've played around with the styles and axml but I'm not really getting anywhere.

Thanks!