@itsdave @srain @nzkiwi68 @awebster
I managed to redistribute exact openvpn networks without usage of supernets in other way:
interfaces > assignments > and assigned openvpn interfaces and enabled them in interfaces menu:
c4974312-a0e8-4d2e-a506-f268071cbe59-image.png
and added "static route targets" pointing to those previously created (and enabled) openvpn interfaces: services > FRR global/zebra > global settings > route handling
7efd11ba-f046-4727-b19c-d4840d9339d7-image.png
hope this will help someone and sorry for reviving a quite old post:)