It’s better to use JSONPath Extractor available via JMeter Plugins (you’ll need Extras with Libs Set).
So on your data following JSONPath Expression:
$..uniqueid
Will return next structure:
["1149","1150","Remarks"]
See Using the XPath Extractor in JMeter guide (scroll down to “Parsing JSON”) for more details and a kind of JSONPath cookbook.
solved Need to extract data from this JSON in Jmeter