When selecting an area, use display for visualization.

[RICE0707]

Display is an entity introduced in version 1.19.4 and exists only in the Java Edition.
It is a highly extensible and performance-efficient new rendering method that can be used to replace particle-based displays in versions 1.19.4 and above.

For example, as shown in the image below (though it may not require this many lines).

[Zrips]

Its on todo list, tho it needs to be added on CMILib side and be more universal thing to be used for multiple plugins, and this will need some more specialized handling. And yes, it would need less of those lines as each one would be one visual block which might impact performance on client side if its spawned for each line