How to access size of Android Drawable

I have the following drawable, called small:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:dither="true"
    android:shape="oval"
    >

    <size
        android:height="10dp"
        android:width="10dp"
        />

    <solid android:color="#FF666666" />

</shape>

I would like to access the height and width defined in size. This is the line that gets the drawable:

val drawable: GradientDrawable = getDrawable(R.drawable.small) as GradientDrawable

GradientDrawable does not seem to have any accessors that provide the size and its fields. Even running in the debugger I see no fields that are set to 10dp. Is there a way to access the size height and width?

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