Issue description
Would be nice to be able to include variables in chat messages. For instance, say you want to send a message to a player telling them how much of a scoreboard or NBT value they have - it may look something like this in mcreator "You have <scoreboard:entry:value> points!". When then player receives it it will show how many points they have for a given scoreboard entry.
This would be a really great temp fix for the GUI sync issue.
If I understood your question properly, then this would be an example on how to do this: