How to blur iOS/Android app view in app switcher

How to / Third Party Tooling
1

Hi,
When A app has been in background, if the app view is clear, user’s data what was inputed can be seen.
I want to blur the view in app switcher because it feels dangerous for security.

for example, like this image.

MicrosoftTeams-image__4_
MicrosoftTeams-image__4_639×1136 53.1 KB

Would you know how to blur the app view in app switcher?

thanks