Exported properties:

• zoom_factor (multiplies Camera2D.zoom each mouse wheel scroll)
• zoom_min (minimum Camera2D.zoom)
• zoom_max (maximum Camera2D.zoom)
• zoom limited (if true, MapCamera2D.zoom_min is effectively increased to stay within limits)
• zoom_relative (if true, mouse zooming is done relative to the cursor)
• zoom_keyboard (if true, zooming can also be done with the plus and minus keys)
• pan_speed (adds to Camera2D.offset while the cursor is near the viewport's edges)
• pan_margin (maximum number of pixels away from the viewport's edges for the cursor to be considered near)
• pan_keyboard (if true, panning can also be done with the arrow keys)
• drag (if true, the map can be dragged while holding the left mouse button)
• drag_inertia (multiplies the final drag movement each second)

Video: https://www.reddit.com/r/godot/comments/wjc2c2/i_made_a_mapcamera2d_script_for_smooth_scrolling/