Use the AddItemsPlugin to add your custom filter to the Studio Library filter section. The component to configure is the SearchFilters class if a filter should be added for the content search.

import Config from "@jangaroo/runtime/Config";
import Component from "@jangaroo/ext-ts/Component";
import SearchFilters from "@coremedia/studio-client.main.editor-components/sdk/collectionview/search/SearchFilters";
import AddItemsPlugin from "@coremedia/studio-client.ext.ui-components/plugins/AddItemsPlugin";
import FooFilterPanel from "./FooFilterPanel";

Config(SearchFilters, {
  plugins: [
    Config(AddItemsPlugin, {
      items: [
        Config(FooFilterPanel, {
          itemId: "fooFilter",
        }),
      ],
      after: [
        Config(Component, { itemId: SearchFilters.LAST_EDITED_FILTER_ITEM_ID }),
      ],
    }),
  ],
})

You can also open the library in a certain filter state, for example from a button in the favorites toolbar. To that end, the ShowCollectionViewAction provides a property filters that can take SearchFilterState objects. So that the action can configure the correct filter, the filterId attribute must be given, matching the itemId of the configured filter panel. The names and values of the attributes are exactly the property names and values of the state bean used by the filter set.