Set the selected row based on calculated value from signal and fields.

For example, if the signal come with the following structure:

{ 'identifier' => 'myTable', 'data' => { 'pointer' => '/1' } }

You can set the row on index 1 (the second row on the table) to be selected by setting this property to 'data.pointer'.

For the selection to work, the calculated value must resolve to a json pointer in the format of /[row-0-based-index]

To unset the selection, the calculated value must resolve to 'null'.