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If I follow you correctly you can change the export policy for both peers should include both prefixes.
With the prefix you want to be primary on that peer have no prepend at all.
With the prefix you want as backup for that peer have the two AS prepend.
During normal operations each prefix will be primary on each side.
When a peer fails, the second prefix is automatically active on the remaining peer.
Thanks for your reply.
Now, I mainly want the 126.96.36.199/24 prefix to use only the primary link, and the 188.8.131.52/24 prefix to use only the secondary link. When one link is down, then both prefixes will run on the remaining active link. Can you help me with this? You can also share a demo example for my understanding."