Logic Pro X's Side-chain function no present in plug-in

Antares-tune vocal EQ has a "external" mode for side-chaining the dynamic EQ compression of the track's signal. However, the usual side chain option on the top right of the plug-in window isn't displayed, so I can select the track that triggers the side-chain compression like in the standard Logic compressor. I checked on Antares's manual on the plug-in's side chain controls, and it says: "The specifics for implementing an external side chain vary from DAW to DAW, so please refer to your DAW’s documentation." There is no such documentation specifically about side chain setting for plug-ins outside of Logic's. I'm only phasing this problem with Antares vocal EQ compression, as other plug-in's with side chain capabilities have the option present.