As an alternative solution, I think you could create a Editable data table using Gallery control instead of the Data Table control. Then within the Gallery, you could add some Label controls to display the column values from your data source, you could set the "Auto Height"property of the Label to true, then the Label would resize its height based on its content.
You could also consider add some Text Input box within above Gallery, and set the Mode property to following:
TextMode.MultiLine /* <-- Display content in multiple line mode */
More details about creating a Editable Excel table using Gallery in PowerApps, please check the following video resources: