Hi @Chocolatefrenzy - great question, yes, as you will need to be able to stamp on it and the dog will get stopped suddenly.
One of the great benefits of the long line is, when you know you can stop the dog more easily you relax a lot more. This makes training less stressful. It's a pain in the rain / mud, but the modern ones wash very easily (unlike the old rope washing lines we used to use!)
Don't just use it when he's doing a runner, gently stand on it while he's walking a bit far in front, at the same time give the "come" command and give a VERY high reward treat and lots of praise, then let him wander on again. You need to reinforce that coming back to you is really rewarding and nothing bad happens. Keep a special treat for recall training, not ordinary everyday treats. Chopped up bits of hot dog sausage work well, or roast chicken etc. If you are meat eaters, and do any kind of roast, then you can portion up small bags of bits to use as treats and freeze them.
With my youngster - who came to me with a reputation as an escape artist - I thought he'd never be off the long line. When I was having a successful walk, rather than pushing my luck, I'd put him back on a short lead after a positive session with the long line, sometimes he went back onto the LL for a final run later in the walk, then back on lead. Always try to end on a positive, having the lead put back on should be associated with "what a good boy" not "you little " The dogs pick up on mood really quickly. You are trying to build up really positive associations with coming back to you and going back on lead if you want him to do it voluntarily.
Don't use the LL as a lead, too cumbersome, it's an aid to teach recall, not a lead.
Finally, be patient but consistent, it might take months. My LL is in the garage, hasn't been used since before Xmas, the youngster now will obey a command to come close (to heel) when we pass cyclists or walkers. Still expects his treat though 🤣 in fact the little smart arse sometime stand still while we walk on and waits for me to give him the "close" command, just to get the treat 😉
Good luck! You can do it.