How change text in animation?

Hello,

For exemple, I got this text 42.3 and I create an animation with a behaviour.

I would like change this text many time during this animation, like 42.2, 42.1, 42.0 etc. when it's going down or 42.4, 42.5, etc. when it's going up.

Please, can I do this in a simple way without adding more text element?

If the Motion team see this message, can you add a fonction like this? :)