Hi Harshraj,
what you have done is half of the process, I think.
I think that there is no need of Boolean attribute.
Same OnChange event of dropdown, you can call a microflow with change object and don't change anything and just opt refresh in client as yes.
and set the datagrid2 datasource as Microflow and pass the dataview object as parameter and retrieve the list there with xpath constraints.
Hope you got it.