Thanks for reaching out!
Just so we're on the same page, would you mind expanding on what you mean by "filter option in dashboards created"?
Were you looking to filter cards on boards (https://help.trello.com/article/787-filtering-search-cards-on-a-board)?
Or, were you referring to filter options in Dashboard view (https://help.trello.com/article/1249-dashboard-view)? If so, that's not possible.
I'll keep an eye out for your reply,
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