Perhaps we need some clarification: the question that you ask is about subinterface but the configuration that you give is not subinterface but is secondary addressing.
HSRP supports secondary addressing without needing a second HSRP group. In defining the shared address you can specify the optional parameter secondary to indicate to HSRP that this is a secondary address range. I am not sure whether the config that you give works, but what I have usually seen is the secondary address specified in the same group as the primary.
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