create textfile for local data storage? flutter - flutter

Hey guys I am new to flutter and at the moment I make an app where I want to storage my sensor data, that I get via BLE, permanent in a text file. My Question is if anyone of you has a link or an example how I can do this because my own research didn't really come up with anything useful
So I get my data like this:
I would be very thankful for any help

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T.I.A
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How can we store textfield values in pdf in iphone application

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XML will be easy to store, easy to retrieve values.
I believe you're looking for xlslib
Good Luck.