averge of tfr over channels

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Is it possible to calculate average of channels in AverageTFR and plot it
as time frequency representation of power?
I want something like this :

power = tfr_multitaper(data, freqs=freqs, n_cycles=n_cycles,
use_fft=True,return_itc=False, average=True,picks=["P1","P3"])

#avg = mne.grand_average(power)
#avg.plot()

I want to average tfr of "p1" and "p3" channel.
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