AWS Dynamodb - PartiQL

Hi, i am using Dynamodb ExecuteStatement with Parameter attribute in nodejs. I am dynamically passing string array to one of the column. But i am getting below error while executing. please suggest the fix.

InvalidParameterType: Expected params.Parameters[1].SS[0] to be a string

Code Snippet:

Parameters: [ { S: <dynamic value 1>

    },
     { SS: [<dynamic value 2>] // eg: l1,l2
    }