One way to add Texts in your drawable layer-list is by creating a png file of the text and adding it using bitmap. Here is one example of it.
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:drawable="@drawable/background"/>
<item android:bottom="150dp">
<bitmap
android:gravity="center"
android:src="@drawable/logo"/>
</item>
<item android:top="60dp">
<bitmap
android:gravity="center"
android:tint="@android:color/white"
android:src="@drawable/text"/>
</item>
</layer-list>