Ridiculous that this is not available. I'm astounded when I come across these simple things that should have been part of the foundation of PowerApps before it was even released. Come on Microsoft!! What is a workaround for this? I have a list that is a keyword lookup for a lookup field in another list. The user should be able to select multiple values from the lookup and they need to have checkboxes to pick. I can't add a checkbox for every value when I don't know what the possible values will be!!! So upset.