Hello AhmedJawad,
Static routing on the template can be configure using IP offsets, as described here:
https://documentation.meraki.com/Architectures_and_Best_Practices/Cisco_Meraki_Best_Practice_Design/...
Based on the example configuration you provided, each child network would use its own subnet, then add the provided offset for the next hop IP. This would work as long as the examples you provided are all that you are looking for with static routes.
If the next hop IP is inconsistent (for example, instead of 10.10.10.2 it was 10.10.10.245 in one network and instead of 10.10.11.2 it was 10.10.10.145 in another network), then this would not help since the offset differs for each network.
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