'Extending "Share" options list on web google maps "share" dialog

I'm building a chrome extension, and one functionality I'd like to add is to allow users sending selected lat/long to a 3rd party service. There is a standard UI for that ( click on a place -> details sidebar opens -> click share button -> share dialog appears ), but it only has 2 fixed services - facebook and twitter.

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Is there a documented way of adding more items to that dialog? ( desktop web experience )



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