Not allowing to add android:exported="true" in xapkreader activity

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Google play store targeted to API 31, For this API level mentioning android:exported="true" is activity is mandatory in AndroidManifest.xml file explicitly. But after adding this attribute my ionic 3 application is not building.

Working
<activity android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale" android:label="@string/app_name" android:name="com.flyingsoftgames.xapkreader.XAPKDownloaderActivity" />

Not Working
<activity android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale" android:label="@string/app_name" android:name="com.flyingsoftgames.xapkreader.XAPKDownloaderActivity" android:exported="true" />

Is there any other way to solve this issue please save my time, Thanks in advance.