Use Ko Player, in ko player if you will assign proxy in wifi settings it will be applied to whole system means all the traffic will be go through the proxy for all apps it will work.
And if still you have any issues with that just DM me I will send you adb command method.
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Seems Ko is for pay. While it can be useful I’m looking for a freeware as I need to use it on various computers.
It’s free I think. Check again
It’s not. Would you mind sharing the adb command method?
yes why not. I am happy to help always. hit me in inbox.
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I would love to have the command also please 
Check the full method here. I have created public topic so all users can use the method.