Center-line tracing is hard to do correctly. In fact, no software has developed a good solution for this requirement, at any price.
Take a look at InkScape (free), as they have this feature, but the results are not what one might expect because it is very difficult to do correctly. We do plan on attacking this challenge, and try to provide a center-line trace in LightBurn, but that is going to take so time, if at all possible. 