Probably not without something like a field mixer first to take the single mono source and route it to both L and R outputs. Then you could reduce the input level of channel 2 on the Zoom by say -10dB for a safety channel. As far as I know, there is no way to route a single source coming into (say) channel 1 to both channel 1 and channel 2 whilst still having independent level control for each. You can route one input to both channels, but the input level remains identical for both.
Hope this helps.
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