This blog walks you through the process of how you can create cascading dropdowns in a PowerApp and save it to a  single line of text column. In this blog a SharePoint list with three single line of text columns has been used to save the item. In addition, three separate lists are used for the cascading dropdown data.

I made this little PowerApp today just to demo the way you can use the Video Control with YouTube Videos. Let me know if you'd like to dive deeper into this one, but I think it's pretty straight forward.