As per my knowledge, you can't call a data transform rule from an expression builder. In Expression builder, only functions and properties could be called. 

But, I would like to understand the use-case where it's needed to call a data transform. Could you elaborate on that?

We cannot call data transform directly from expression builder. Your requirement can be achieved through below steps

1. Create a data transform

2. Create an activity which calls the above data transform

3. Create a custom function which calls above activity

4. Use this function in the expression builder

Detailed steps are attached to this post.

Hope this helps you!

Hi

We have a function "ApplyModel", using this we can call Data transform from Expression builder. Please let me know if it helps your requirement.

Thanks