Edit file using logstash

I have already created a topic here to add [] to the beginning and end of the file and I can't find the solution so I want to ask if I can edit the file using logstash now my file like this:

{"field1": "value1","field2":"value2"}{"field3":"value3"} .... 

so i want to add [ at the beginning of the file and ] at the end of the file

Any help would be sincerely appreciate!

You can use a mutate filter to gsub square brackets onto the start and end of the field.

yes, i can edit a field using gsub but i can't edit the file with gsub

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