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select "field occurrence" in "Plots" window

Hello!

I am working with IEC61850 Sample Values data. Inside the frame, there is a "sv.meas_value" field in witch the measurement values are decoded. In fact, this "sv.meas_value" field is an array of values (eg. voltage/current per phase, at that the frame sample time).
What I want to plot is one of the values (eg. the first field, corresponding -eg- to phase A voltage).
It seems that there is no option in the Plots window to select a occurrence of the "Y Field", and I tried several options (use of sv.meas_value[1],sv.meas_value[1:1],sv.meas_value#1,sv.meas_value@1,...) unsuccessfully.

As comparation, when editing columns, it is posible to select the "field occurrence", and it works nicely :-)
Any help would be appreciated. And if this options is not implemented, it would be nice (and I think easy) to add it.

Thank you and regards!
Josep

(ops... I was trying to add a couple of images, but it seems that I do not have points... sorry :-) )