Most of the useful stuff is measured at/by the meter.
You could push the DC voltage and current from each string (MPP) if you wanted to along with the log push but there isn’t a lot else to choose from.
e.g. add to your log push
&v7=Current_DC_String_1&v8=Current_DC_String_2&v9= Voltage_DC_String_1&v10= Voltage_DC_String_2
Then you could set up a calculation for v11 and v12 which multiplies the string current and voltage to generate a power value by string. These are only snapshot values though, not an average for the interval, and as such is of limited value.
I use Open Weather Map to upload temperature data: