Passing external variables to a painless script

In painless script, i tried passing a variable which stringifies a json object, like this:

let sourcedData = JSON.stringify(body)
body: {
       lang: 'painless',
       script: 'if (ctx._source.files == null) { ctx._source.files = params.object } else { ctx._source.files.add(params.object) }'
     params: {
         object: sourcedData
    refresh: true,
    type: DocType

Although it does not produce any error, but the field files is null, Is there any way we can pass these kinds of variables within painless?

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