When using items { label: string, value: string} input with value should only have value as value for native form support

[m-dressler]

Currently when using items with the Array<Object> variant, the value of the hidden input which receives the name attribute is set to JSON.stringify version of the Array<Object>.

Instead, when there is a key value in Object, the input should use that for its value such that no form transformation on the FormData is required.