I am trying to configure CiviCRM Form Processor. I am using a form with a field of type "option group" (let's call it the `Products` field) where customers can choose a product. They can choose multiple products at a time, which are handed over to CiviCRM as an array of strings (according to API Explorer). I want to create a CiviCRM Activity for each of these options chosen in the `Products` field.

I already created an Action of type "Create/Update Activity" for each product, based on the condition "Array parameter contains" and I chose the `Products` field as the parameter. This works.
But my problem is, when creating the Activity, a custom field should be automatically set with the product name a.k.a. option group value. That is, I do not only want to check if the output array of the `Products` field *contains* a certain value, but I also want to use that value when creating the Activity.

I tried to use the pre-built Action "Others: Explode List" with the `Products` field as a param, to get access to each single product / option group value. But the API Explorer threw the error that this Action was given multiple values instead of a single one. So I suppose the `Products` field returns multiple values already.

Now I wonder how I can use these values in my `create Activity` Actions?
When I am editing an Action, I do have the choice to fill fields with the value of `Input::products`. But which value is that, if `Products` field returns multiple? How do I access the second value, for example?

I am thankful for any hint.