How to config Routing Filter BGP

Can help me about this problem ?
How do I configure the routing filter so that the prefixes obtained from ISP 2 are intact to the client ?
because the prefix is ​​obtained by router distribution mix best path from ISP 1 and ISP 2 .
This is the topology
TOPOLOGI.png

You can do that by increasing the local-preference to your prefixes learned from the ISP2 → but it will affect your entire network by electing only the uplink through ISP2

//routing filter add chain=isp2-in action=accept set-bgp-local-pref=1000