You can manually add icons to the config.xml file that PhoneGap uses. Unzip the file created by Aware IM, modify the file config.xml (in the root) and zip it back.
You can add something like this to your config,xml
<platform name="android">
<allow-intent href="market:*" />
<engine name="android" spec="latest" />
<resource-file src="google-services.json" target="app/google-services.json" />
<plugin name="cordova-plugin-permission" source="npm" spec="latest"/>
<plugin name="cordova-plugin-android-permissions" source="npm" spec="latest"/>
<config-file target="AndroidManifest.xml" parent="/*">
<uses-feature android:name="android.hardware.camera" android:required="false" />
</config-file>
<icon src='resources/icons/android/ldpi.png' platform='android' qualifier='ldpi' />
<icon src='resources/icons/android/mdpi.png' platform='android' qualifier='mdpi' />
<icon src='resources/icons/android/hdpi.png' platform='android' qualifier='hdpi' />
<icon src='resources/icons/android/xhdpi.png' platform='android' qualifier='xhdpi' />
<icon src='resources/icons/android/xxhdpi.png' platform='android' qualifier='xxhdpi' />
<icon src='resources/icons/android/xxxhdpi.png' platform='android' qualifier='xxxhdpi' />
<splash src='resources/screen/android/splash-port-hdpi.png' qualifier='long-port-hdpi' />
<splash src='resources/screen/android/splash-port-ldpi.png' qualifier='long-port-ldpi' />
<splash src='resources/screen/android/splash-port-mdpi.png' qualifier='long-port-mdpi' />
<splash src='resources/screen/android/splash-port-xhdpi.png' qualifier='long-port-xhdpi' />
<splash src='resources/screen/android/splash-port-xxhdpi.png' qualifier='long-port-xxhdpi' />
<splash src='resources/screen/android/splash-port-xxxhdpi.png' qualifier='long-port-xxxhdpi' />
</platform>
<platform name="ios">
<allow-intent href="itms:*" />
<allow-intent href="itms-apps:*" />
<engine name="ios" spec="latest" />
<splash src="resources/screen/ios/Default@2x~universal~anyany.png" />
<plugin name="cordova-plugin-ios-camera-permissions" source="npm" spec="latest"/>
<plugin name="cordova-plugin-ios-location-permissions" source="npm" spec="latest"/>
<icon src='resources/icons/ios/Icon-App-20x20@1x.png' platform='ios' width='20' height='20' />
<icon src='resources/icons/ios/Icon-App-20x20@2x.png' platform='ios' width='40' height='40' />
<icon src='resources/icons/ios/Icon-App-20x20@3x.png' platform='ios' width='60' height='60' />
<icon src='resources/icons/ios/Icon-App-29x29@1x.png' platform='ios' width='29' height='29' />
<icon src='resources/icons/ios/Icon-App-29x29@2x.png' platform='ios' width='58' height='58' />
<icon src='resources/icons/ios/Icon-App-29x29@3x.png' platform='ios' width='87' height='87' />
<icon src='resources/icons/ios/Icon-App-40x40@1x.png' platform='ios' width='40' height='40' />
<icon src='resources/icons/ios/Icon-App-40x40@2x.png' platform='ios' width='80' height='80' />
<icon src='resources/icons/ios/Icon-App-40x40@3x.png' platform='ios' width='120' height='120' />
<icon src='resources/icons/ios/Icon-App-60x60@2x.png' platform='ios' width='120' height='120' />
<icon src='resources/icons/ios/Icon-App-60x60@3x.png' platform='ios' width='180' height='180' />
<icon src='resources/icons/ios/Icon-App-76x76@1x.png' platform='ios' width='76' height='76' />
<icon src='resources/icons/ios/Icon-App-76x76@2x.png' platform='ios' width='152' height='152' />
<icon src='resources/icons/ios/Icon-App-83.5x83.5@2x.png' platform='ios' width='167' height='167' />
<icon src='resources/icons/ios/ItunesArtwork@2x.png' platform='ios' width='1024' height='1024' />
<splash src='resources/screen/ios/Default@2x~ipad~anyany.png' width='2732' height='2732' />
<splash src='resources/screen/ios/Default@2x~ipad~comany.png' width='1278' height='2732' />
<splash src='resources/screen/ios/Default@2x~iphone.png' width='640' height='960' />
<splash src='resources/screen/ios/Default@2x~iphone~anyany.png' width='1334' height='1334' />
<splash src='resources/screen/ios/Default@2x~iphone~comany.png' width='750' height='1334' />
<splash src='resources/screen/ios/Default@2x~universal~anyany.png' width='2732' height='2732' />
<splash src='resources/screen/ios/Default@3x~iphone~anyany.png' width='2208' height='2208' />
<splash src='resources/screen/ios/Default@3x~iphone~comany.png' width='1242' height='2208' />
<splash src='resources/screen/ios/Default~iphone.png' width='320' height='480' />
<splash src='resources/screen/ios/Default-568h@2x~iphone.png' width='640' height='1136' />
<splash src='resources/screen/ios/Default-667h.png' width='750' height='1334' />
<splash src='resources/screen/ios/Default-736h.png' width='1242' height='2208' />
<splash src='resources/screen/ios/Default-Portrait@2x~ipad.png' width='1536' height='2048' />
<splash src='resources/screen/ios/Default-Portrait~ipad.png' width='768' height='1024' />
</platform>