I may be missing the point here, but do you have to define the column names in the ui_control/tabulator object? The number of columns and the column names will change, you say. Couldn't you just let ui_table use the row object properties as column names, and specify that the column width should fit the data? This can be done by setting ui_control to {"tabulator": {"layout": "fitData"}}. Alternative layouts are fitDataFill, fitDataStretch and fitColumns.
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