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Here is a google play app called After focus and Afterfocus pro. There are foreground, medium and background option for the blur distances.
Try using AfterFocus
I find it the best out there. There's a pro version as well.
Give it a try and see the magic.
Could use an app like AfterFocus to edit your picture: [link]
I use the pro version of this, works really well for me.
Try this app [link]