I don't know about an image specifically like that but you could maybe place an image/event over the quest character that has the "through" box checked if you have access behind the character. This is a complete guess though.
If there was an award for best game dev procrastination, I'd say 'meh, I'll pick it up tomorrow'
Honestly though, I've been staring at the same half-made map for a while now haha! Ahhh, I'm so tired of mapping!