Whiteboards: Connect arrows to a specific point or line inside a block

Right now, connections on whiteboards can only attach to fixed anchor points on a block's edges. When a block contains a long object, like a screenshot of a route diagram or a definition with several sections, I'd love to point an arrow at the exact spot I mean. For example, I'd connect one specific line in an image (e.g. "Error Dimension (~17 m)") directly to a related definition object.

Suggestion:

• Let connectors attach anywhere along a block's border, not just at the fixed anchors.
• Ideally, also allow anchoring to a specific position inside an image or embedded object, so the arrow stays pinned there when the block is moved or resized.

This would make whiteboards much more useful for annotating diagrams and linking details to knowledge objects. Thanks, the whiteboards are already such a great feature!