To set the tags in the Easy Chart back to their default value, you can simply reassign the tagPens property in a script. That means you’ll need to define the tagPens dataset with the expected format. Take a look at [this] (Can't set pen attributes for Easy Chart template) post where another user is setting tag pens via scripting.
You can do something similar to the Date Range component by setting the startDate and endDate properties in a script.