Currently only content controls of type RichText are support (see https://dev.office.com/reference/add-ins/word/contentcontrol). Please add support for other types, specially BuildingBlockGallery, Ch...
maja_damjanic
Microsoft
MicrosoftMember of the product team here, we are looking into this area.
If interested in this space, please go ahead and fill in this survey to help us understand and prioritize requirements: https://aka.ms/WordAPI