Pass metadata filter to vertexAISearch tool

I want to implement access control for the data store created out of unstructured data stored in google cloud storage.

I have added a metadata file as mentioned here. In order to use restricted set of files from data store based on who the user is, we need to send the user id as a filter parameter as shown here.

Is there a way to pass the filter value to google.adk.tools.VertexAiSearchTool? If not, please suggest the alternatives.