We are trying to add a drop-down control in the command bar of a page or beside the share button on a SharePoint Online site.
May we know if there is a specific placeholder we can use to achieve this?
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Not at this moment, however it is in the works according to this uservoice:
In addition to the Header and Footer page placeholders you have the ability to customize list menus: https://docs.microsoft.com/en-us/sharepoint/dev/spfx/extensions/get-started/building-simple-cmdset-with-dialog-api
But this will not be applicable in a page view context...