How to run a business process from a Freedom UI page button and pass both selected detail records and current page ID?

Hi Creatio Community,

I’m working on a Freedom UI page in Creatio (v8.2.x) and trying to implement the following scenario:

• I have a detail (DataGrid) with a list of certificates on the Activity page.
• I’ve also added a custom button to the page.
• When the user selects several records from the detail and clicks the button, I want to:
  • Get the selected records (certificate IDs),
  • Get the ID of the current activity (parent page),
  • Pass both as input parameters to a business process (to link the selected certificates to the activity).

Using no-code tools alone, I was only able to pass either the collection or the current page ID, but not both at the same time.

Has anyone implemented a similar case?
Would appreciate any working example or best practices for this scenario.

Thanks in advance!