Hi,
Non-ospf routes are considered as external routes [LSA Type 5] and have an interarea flooding scope, hence policies are applied globally and external routes are exported to all areas under ospf.
set protocols ospf area 0.0.0.0 network-summary-export send-aggregate
The above command is for Network Summary LSAs [Type 3] which are generated by an ABR in a multi area OSPF topology. The export policy [send-aggregate] enables you to specify which network summary LSAs are flooded into an area. It is possible to summarize Type 3 LSAs using area-range.
I believe in your case [static/aggregate] injected in ospf cannot thus be constrained to specific ospf interfaces.
Cheers,
Ashvin