Hey Tarun,
It sounds like you're doing the right thing. This should work:
import FilterBarQueryFilterProvider from 'ui/filter_bar/query_filter';
// Somewhere in your directive, service, or controller
const queryFilter = Private(FilterBarQueryFilterProvider);
queryFilter.getFilters(); // returns array of **pinned** filters
If you're still stumped, try asking on our IRC channel.
Thanks,
CJ