This Unreal Engine 5.4 video is about adding a ToolTip Widget to the Tower Action Buttons with custom Data.
We start by creating the ToolTip Widget Blueprint, and then explaining why we’re not going to do this the easy way. Next, we create a Tower Action Slot Widget Blueprint to replace the basic buttons, and then make use of those new Slot Widgets in the Tower Actions Widget Blueprint. Lastly, we update the Tower Action Blueprint Interface with GetTowerDetails, that we implement in the Tower Base Blueprint, followed by adding a call to it in the ToolTip Widget Blueprint.
https://dev.epicgames.com/community/learning/tutorials/awrz/unreal-engine-33-tower-action-tooltips-let-s-make-a-tower-defense-game