Reference

PowerPoint content
dml()	Wrap plot instructions for DrawingML plotting in Powerpoint
ph_with(<dml>)	add a plot output as vector graphics into a PowerPoint object
dml_pptx()	DrawingML graphic device for Microsoft PowerPoint
Excel content
xl_add_vg()	add a plot output as vector graphics into an Excel object
dml_xlsx()	DrawingML graphic device for Microsoft Excel