Current use cases include:

• Show the Player's next checkpoint: https://github.com/filoghost/HolographicDisplays/wiki/Individual-holograms
  An official version of this workaround, using a entry in the strings.yml for what text to display:
  

This has been implemented in the pending 7.0.0 release.
To avoid another dependency, a workaround has been achieved.
There is a new Checkpoint placeholder which will be populated when the next checkpoint matches the placeholder value.
A tutorial on this will be found in the docs when deployed.