A useful funnel names the stages you can actually see: a person finds the offer, understands it, starts a conversation, and becomes a customer or does not. It is not a diagram with a dozen labels nobody measures.
For each stage, name the page or the message that does the work, and the person who owns the handoff. If a stage has no owner, it is a slogan.
Sovassa plans channels against that path. A channel without a stage to serve can wait.