Grid Widget supports a simplified flow for filling it with data from existing Query.
You can use the SELECT QUERY button to automatically fill in the Grid with all the content from one of the selected Queries in the project. All values are referenced with formulas, so for example you can change datasets used to update the input data and the changes will be automatically reflected in your Grid Widget. If input query structure allows it, the formulas created will automatically include dynamic rows and column references, to give you easier entry into more powerful Grid features.