Bird BGP routing to iBGP router with prefix segmentation from /22 to four /24

First of all, I am a newbie to Bird and BGP routing. My question is, how can a router route traffic towards a lower router and segment from a one /22 prefix to four /24 prefixes?

I tried to setup a network topology as below (addresses are just an example):

IXP 10.10.0.2/20
 | 
 |
 eth0:10.10.0.40/20
 | 
 R1 -- dummy0: 180.200.0.1/22
 |
 eth1:180.201.100.2/29
 |
 |
 eth0:180.201.100.3/29
 R2
 |__eth1.101:180.201.101.4/24
 |__eth1.102:180.202.102.1/24
 |__eth1.103:180.202.103.1/24
 |__eth1.104:180.202.104.1/24

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