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How to create a unix timestamp time series

I have CSV data in this format:

1499508626919,0.896459102631,0.967982234394
1499508628925,0.89670330286,0.968245917905
1499508630928,0.89719170332,0.968773284928
1499508632938,0.89694750309,0.968509601417
1499508634943,0.89670330286,0.968245917905

The first column is a date/time in unix format including milliseconds. How can I create a time series chart that interprets the first column correctly as a timestamp? At the moment, Plotly gives the labels on the x axis values such as 1.49950862T. I could not find any options for changing the expected format of the input data in any part of the UI. Is this even possible?