@MAYANKT6

Approach1:

You can use the OOTB function pxPageListFromStringCSV where comma separated values passed will populated to pagelist as defined in the function. Please find the attached screenshot to check the parameters.

You can call this function from an activity by Call-Function method.

Approach2:

Create a parse delimeter rule with comma separated as delimeter.Get the comma separated static values to some  parameter and pass it to the activity method.Apply-Parse-Delimited