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Hi, you can accomplish that by adding a Text field in your form, that can be found under the "Form Tools", then, click on "Edit HTML", and on the HTML icon to create a table with html codes.
However, I would add a matrix if I need an array of arrays of data, I recommend you to drag and drop, from Survey Tools, a Matrix field in your form.
Click on "Show Properties" to customize it:
Also, you could use the Matrix Dynamique widget on your form, just click on "Widgets", and type "Matrix" to drad and drop the widget into your form. Hope this helps you, let us know if you have more questions.