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As far as I know, the highcharts cloud supports importing data from JSON, CSV files or google spreadsheets. So all you have to do is to export data from your server to one of the supported extensions and just connect it to your chart. You can find more information including youtube tutorials in our official docs I attached below.
Docs references: https://cloud.highcharts.com/docs/#/live-data
Live demo: https://cloud.highcharts.com/show/ycjJa0Vw
Let me know if you have any further questions!