Vulnerability in PWA installed on android device

Hello All,

Greetings!

We have developed a PWA using the Ionic framework. Please help us with the vulnerability regarding the allowbackup tag. We want to set value allowbackup tag to false which is generally presented in the Androidmanifestfile.xml of the android application. However, we want to set it for PWA in manifest.webmanifest file.
So, let us know that is it possible in the ionic framework?
Thank you in advance.