如何获取json属性内容

我使用属性来保存json负载

<property expression="json-eval($.)" name="req_json" scope="default" type="STRING"/>

json内容如下:

{ "schema": { "computerName": "PC243854", "ipAddress": "11.2.45.120"}, "data": { "code": "ZFIR006", "filters":[{ "dataType": "integer", "fieldName": "TEST", "operator": "=", "values": ["1","9"] } ], "schema":1} }

我想使用“req_json”属性来获取过滤器的json内容值,我该怎么做?

[{ "dataType": "integer", "fieldName": "TEST", "operator": "=", "values": ["1","9"] } ]