perform the steps below to import youtube account subscriptions:
open google takeout and log in: https://takeout.google.com/takeout/custom/youtube
click on All YouTube data included and only tick subscriptions in the dialog that opens
click on Next step, then on Create export, then on Download
extract downloaded archive and copy subscriptions.csv to the ikatube config directory where favlist.json is
set update_favorites to true in ikatube.json
the subscriptions will be imported the next ikatube is started
note: the imported subscriptions do not have thumbnails after a fresh import. once the channel video list is loaded by clicking on it, the thumbnail and video count will be updated automatically and saved.