While using data expressions to load data within dashboard elements for graph suppose, can we use the selector text as input to filter the features in the data expression.
The simple answer is "yes". You can definitely use a selector to filter a graph, regardless of whether it's a Data Expression or standard feature layer source.
How you do that really depends on the way you build your Data Expression and how the selector and graph are configured. Can you share more information about your dashboard?
By using group by value in Data expression. So, when we filter the values in Selector, it should display those particular values data in graph or indicator. We can perform this kind operations in Dashboard.
I've been working on and wondering this also for weeks and haven't been able to find documentation on how to get this done.
It seems like it's not a possibility if you're using the GroupBy function, but I'm by no means an expert in the matter and would LOVE to hear from other folks who are more experienced with Data Expressions.