Android Webview evaluateJavascript not able to find function inside a ES6 module file

I have an Android Webview and I have an HTML file that is loaded inside the WebView.

The html has a function like this

<script>
function dummy() {
   console.log("inside dummy class");
}
</script>

Now when I call the below code, this works fine.

webView.evaluateJavascript('dummy()', null)

However when the script is an ES module like this, the above code is not able to find the function.

<script type="module">
function dummy() {
   console.log("inside dummy class");
}
</script>

The above example is a much simpler representation of the actual code. But I need to call evaluateJavascript from Android's Webview for functions which are present in a ES6 module file.

How do I achieve that?