When transitioning between Levels, I would like to add a LoadingLevel using TransitionMap.

When switching between different levels (worlds) rather than level streaming (using ClientTravel), the Unreal system removes the current level, assigns the loaded level (next level) to GWorld, and then changes the world through initialization and settings.
This happens inside FSeamlessTravelHandler::Tick.

At this time, if I use TransitionMap, Player will go to TransitionMap in the middle, and then immediately move to the next level when the next level is finished loading.

I don’t want to use World Composition.

What I want to do is, I want to delay moving the next level from the TransitionMap by specific time after the next level has finished loading and the next level’s level streaming has finished updating.

Is it possible?