Trying to show a new variable in JS about gantt

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Hello,
Gantt is a client-side application, everything you update in the chart occurs on the client-side. The Data Processor helps to connect it with the server-side.
The leftside_text template uses the task object as a third parameter:
https://docs.dhtmlx.com/gantt/api__gantt_leftside_text_template.html

So, when you name the third parameter as users you just give a different name to the task object. You need to implement a custom solution to obtain the data from your table in a variable and use that variable to show the data in the template:
http://snippet.dhtmlx.com/41452f541