How can I get CorelDRAW host Application Object on webview？

When I use IE mode, I can obtain the host object of CorelDRAW through the following API
window.external.Application;, But when I switched to Webview mode, I couldn’t retrieve the object,

screenshot: https://i.sstatic.net/JN8xM72C.png

Here is my AppUI.xslt core code,

    <xsl:template match="uiConfig/items">
    <xsl:copy>
        <xsl:apply-templates select="node()|@*"/>
        <itemData guid="50da125a-a3e2-4038-85ef-04a4e3ab1b8f"
            type='browserEdge'
            suppressDialogs='false'
            openExternal="true"
            href="[VGAppAddonsDir]/PopupHtmlAddon/index.html"
            enable="true" />
    </xsl:copy>
</xsl:template>