How to model SSHP with DOAS in Open Studio

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Hello Energy Modelers! Anyone modeled Split System Heat Pump with DOAS? In Openstudio, one zone can only attach to one air loop. So assign zones to both DOAS air loop and SSHP air loop seems impossible. Also, if model SSHP as zone level HVAC, Open Studio only has PTHP, which is different with SSHP.

Many thanks!