You could add a multi-select input in the dashboard. This will allow you to choose multiple values and use them anywhere on the dashboard.
Click on the "Edit" button on the Top Right corner. Then click on "Add Input" and choose Multiselect.
Give token a name like multi_input. The value can be retrieved anywhere in the dashboard by calling the variable $mulit_input$.
Give static values and view the preview to add delimiters or so.