Click to drag yes since it's just using ImGui::SetScrollX, ImGui::SetScrollY based on mouse events. For zoom, it could be in user code if it's your own custom widgets or rendering with ImGui::GetWindowDrawList()->Add{Something}, but I don't think Dear ImGui has a super great api for zoom with the built in windows/widgets like we're talking about here. It's a limitation of this api, not the immediate mode paradigm in general (like the article argues).

For example, ImColorTextEdit renders an ImGui:Dummy() to create a dummy widget of a specified width and height which defines the scroll area, and then based on the current ImGui::GetScrollX() and ImGui::GetScrollY() it uses ImGui::GetWindowDrawList()->Add{Rectangle,Line,Text, etc} to custom render the contents inside the widget based on what should be visible at the scroll positions. Since it's custom code it would be easy to use a zoom param to adjust the scale of things and what is submitted to the draw list.