Yandex map with an unusual filter?

Question

Yandex maps

Good afternoon!
There is a task to make a map with an unusual filter. When you hover over a certain object on the filter, both the object itself on the map and the object on the filter should be highlighted in red.
Never faced such a challenge. Tell me, please, where to dig.

Answer 1

Dig here https://tech.yandex.ru/maps/jsbox/2.1?from=jsapi see how the image for tags is set https://tech.yandex.ru/maps/jsbox/2.1/icon_customImage here is the list of objects on map with navigation https://tech.yandex.ru/maps/jsbox/2.1/object_list and here is changing the label icon while working on the example of hovering with the mouse https://tech.yandex.ru/maps/jsbox/2.1 /event_rollover