Filter criteria in SDP created from REST integration

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Hi Experts,

Calling the Integration REST in the VBCS. I am directly binding the table with the REST endpoint that is creating the SDP. Now I want to filter the data from SDP created. For this, I have an input text along with a InputTextValueChangeChain. 

In the Action chain, dropped the assign activity and using the filtercriteria of the SDP. In the filter criteria, provided the code to filter data as below:

{
 "filterCriterion": {
  "op": "$eq",
  "attribute": "Errors.InstanceId",
  "value": "{{ $chain.variables.value }}"
 }
}

but data is not filtered out. Can you please help what is the issue with the code.