As per my knowledge you can not pass list(you can concatenate as string and pass) as a parameter to Dpage like any other rules Datatransform, activity because mostly Param values hold the scalar inputs.

We cannot pass a list as a parameter to a data page. 

As a workaround, you could pass a string parameter which has the reference to the list. In the load activity, you can get the list from the reference.

Maybe some other workaround could work for you: create the named top level page, put this list there and pass its name as a DP parameter, then you can fetch this list directly from named page.