Pass values to child table selection field

In the Sales Invoice doctype, I put a table with the intention of grouping the Items by their group and VAT. I made a whitelist function that to capture the tax values and send them to the view through a, this as you can see works, but now I need to pass them to the selection field of the child table “Grouped Item Description” but I can’t find a way . Please anyone have any ideas.

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