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The short answer is you can't because VPC peering doesn't support transitive routing. The rule for transitive routing is that the traffic must either originate or terminate on a network interface in the VPC. This is why VPC Peering isn't transitive - no network interface is involved, so no route table. Also this is why Transit Gateway is transitive as its attachment points in a VPC use network interfaces.
The usual approach is for your site-to-site VPN to have VIFs to each VPC, or better still, to use Transit Gateway.
Another workaround is using a proxy instance to put a network interface into that VPC you want to transit through. See for example the standard "Transit VPC" Strategy that was more commonly used before Transit Gateway came along.
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