Don't think searchbar in recent can be implemented becoz it's based of pixel launcher ..not a feature of quick step. And app suggestions in recents come from action services. Install it as system app.Auto brightness toggle option missing in QS.
Need modification in launcher:
1. Google search bar at the bottom.
2. App suggestions while viewing recents ( as in pixel)
Like in the attached screenshot. @ishubhamsingh It would be very great sir, if you add these minor features and tweaks.