If you sent it as a command using REST API - yes.
As this seems to be more of a “sensor” type value, humidity? it might make more sense to use REST API to send it as a state update.
That would have it act more like conventional bindings to real devices.
It’s up to you to choose how to use REST API
That comes from the autoupdate feature. It listens for commands to an Item, guesses the effect on the state.
It is enabled/disabled per Item, and is active by default.
Note it does not act (is not needed) when you update rather than command.
If your Item happens to have UoM specified, you may also need to specify units in your command/update, or automatic scaling could kick in.