I tried to work on a project in Lyra and I had a need to create a custom tag stack to count players from two teams. Is it possible to do this through blueprints or is c++ necessary?
Do you mean Gameplay Tags?
You can use them in Blueprints. There are two types of a struct: GameplayTag and GameplayTagContainer. Just create a variable to blueprint which type is either gameplay tag or gameplay tag container to set them in details panel via gameplay tag editor widget.