For Type “Contact” I can select all kind of tokens, also those I created myself, but for the sender I am limited to names, email address and telephone #. I need to select a “registration URL” for an online round table. The URL changes from time to time. Therefore, I need a token for it, so that I have to change it only once centrally and not in all sequences/snippets/templates when it happens. Is there any way doing so?