creeate notepad++ regular expression

I have date time and weight data in one format in a text file and I need a notepad++ regular expression find/replace expression to convert it into a different format. e.g.

from format
yymmddhhmmss,Weight(kg)
210815091806,59.7

to format
Weight Date,Weight Measurement,Weight Unit
2021-08-15T08:15:34.000Z,69.7,kg

(the data values in the two formats is not exactly the same