[Excel] (Custom functions) Add new cell value type JSON parameter

[alison-mk]

Documenting feature from OfficeDev/Office-Addin-Scripts#867

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[AlexJerabek]

@alison-mk What's the status of this new parameter? Should we revisit this PR?

[alison-mk]

@alison-mk What's the status of this new parameter? Should we revisit this PR?

@AlexJerabek This feature recently entered preview and this article will be published in the next few weeks.