How to only route one app's traffic through the VPN?

Question

How to route only chosen app's traffic through the VPN and make sure it doesn't connect outside of the VPN? There are two use cases:

Apps not available in my country (for example Pandora) which I would like to use nonetheless and not accidentally burn/flag my account by revealing the real connection source.
Similar but for a browser. I would like to have a dedicated browser (maybe Brave) for connecting to some sites. Kinda like Tor Browser but without the hassle, slowness, and suspicion associated with Tor.

I do this successfully on the desktop by running a Mullvad VPN but only routing 10.0.0.0/8 through it and setting the browser to use the SOCKS5 proxy. This neatly routes only that browser's traffic through Mullvad while at the same time simply failing (kill switch) when the VPN is not active.

On Android, Mullvad app supports "split tunneling" which does the inverse of what I want. It allows to choose apps which are not routed through the VPN while all others are.

Web Browser is simple: there are multiple web browsers like Opera available with built in VPN just for the browser itself. — Robert, Nov 11 '23 at 22:08
@Robert This is kinda like the Tor browser. I would prefer an arbitrary VPN and Mullvad in particular currently. — Damn Terminal, Nov 11 '23 at 22:26
Then just use a VPN app that supports "per app VPN" with app whitelisting (in difference to app blacklisting done by Mullvad). — Robert, Nov 11 '23 at 23:12
Welcome to Android Enthusiasts. Looks like there are similar questions already: How to VPN only a single application?. Does it help? — Andrew T., Nov 12 '23 at 03:55
@DamnTerminal Sorry I don't know, just use the correct name of the Android feature to search for it or open a question on our sister site Software recommendations as asking for app recommendations is off-topic here. — Robert, Nov 12 '23 at 12:36

How to only route one app's traffic through the VPN?

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