Json and Expression[Map]

Hi I really like being able to use Expressions to have Gatling figure out what to do based on the current session.

val json = Json.stringify( Map( "playerId" -> session.fmt(PLAYER_ID), "gameId" -> session.fmt(GAME_ID) ) )

session.fmt simply returns the stirng wrapped in “${name}” for it to be consumed by the Expression.

The issue is that stringify will evaluate all those values as strings so all values will have quotes.

How can I make an expression of a Map or evaluate the Expression differently?