openvpn server multiple share route

Hi We have two RT-AC68U with Merlin 380.61 "Site-to-site" is accomlished with openvpn. Main office - openvpn server1, second office - openvpn client. Should be the typical setup. I would need to add a openvpn server2 on Main office side, but so that also the second office from server1 is...