Molang for target selectors! (MCBE)

You could be able to detect if a player is sneaking, or if an entity is performing an action, or even the time of day! I would imagine it be like "@e[molang={"expression"="output"}] ("expression" being the Molang expression that returns a value and "output" being the value the selector wants. If the expression returns the expected value, it selects the entity.)