From what you are saying you are not explicitly using parameters, because when you run a transformation with parameters defined you can set their value in Spoon before launching the transformation, as shown in the screenshot attached.
If that's not your case, maybe you could created a modified transform2 using explicit parameters for debugging purposes, that is what I would do.
Maybe someone more experienced with PDI has some more alternatives, there's a plugin out there on Github to help with debugging purposes, but I haven't used it to create datasets for testing purposes, only to skip steps: http://diethardsteiner.github.io/pdi/best-practices/2019/01/09/PDI-Unit-Testing.html