Ability to keep Messages for Web running in the background

With both Brave and Chrome you are able to download the Messages for Web (https://messages.google.com/web/) app.

This is very useful and saves time, but what Chrome has that Brave doesn’t is the ability to run the app in the background after closing it. This unfortunately prevents users from getting desktop notifications for new messages, which chops off half of it’s functionality.

I think it would be great if we were given the option to pick and choose which apps would be able to run the in background after closing. Really great.