Output linestring

I'm really interested on this one, too !

PS. Actually I'm struggling to achieve this but had no results so far. I'm trying to create it using WKT.

Would also like this ability and have not been able to figure it out despite much effort.

Any pointer on how to achieve this?

There are different ways to achieve this, but it's not the business of this module.

For example, you could create a JS that loop through your layer's feature and link them.