Page Comparison

Check the box(es) of the desired node(s) or use the master checkbox at the top left of the window to select/unselect all. Then, click the Extract button at the top right of the window, which is enabled after checking at least one box.

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The next window displays the selected nodes with the properties they will have when added as new fields so you can change them before confirming. 
Give each field the desired name using the Field Namename fields.

You can choose the data type for each new field or leave the JSON data type. The available options will be automatically determined for the kind of string recognized (for example, numbers could be integer or float). Click the data type icon of the desired row under the Type field to switch between the different options.

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You can use the Prepend original field name checkbox to add the name of the data table field to the beginning of the new field name.

Use the Generate shorter names checkbox to remove characters preceding an underscore.

Click OK and the fields will be created in the table, each of them with the name and data type indicated and each cell displaying the corresponding value of the corresponding JSON.