Add a child product to grouping one

That's how you add child product to grouping one.

Please bear in mind, that quantity isn't required and if used, cannot be a string - must be Integer (so there's no quotation mark)

Both products must exist before this operation.

mutation {
    input: { sku: "SKU_GR_PRODUCT", childSku: "SKU_test2", quantity: 1 }
  ) {

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