While the administrator can currently control all of the parameters for a chart, users having the ability to customize their own version of the data being presented has been requested by several of our users (similar to how an administrator can create a table widget, but then users can control the searching/sorting/filtering of the table within the bounds of the data that the administrator has designated to be included).
As an example, we have created line charts to show the number of pending messages in a messaging queue (this can be helpful both in determining current performance of a service, as well as identifying throughput issues for further investigation). As an administrator, we have configured the displayed line graph to show the past week's worth of data in hourly increments - but not all messaging queues are equal, and so changing the range and/or granularity might be helpful to a user looking at a particular queue.
(I fully recognize that this is a bit more complex of an ask than adding searching/sorting/filtering to tables, given the different chart variants and their associated types - but I am hopeful that some of the same UI logic involved in the administrative modal for configuring a given chart could be grabbed/repurposed/trimmed down a bit to offer end users the ability to have some of the same same-session data manipulation that they do in the table UI today.)