As Welsh Gas says you need a figure of 8 strip (sometimes they come with the awning so check). You'll also need a kador strip to put in the awning chanel. The kador strip has beading on each side, one side fits in to the wind out awning chanel (you need 6mm) and the figure of 8 slides on to the other side's beading. Then your driveaway awning's beading fits in to the empty figure of 8 chanel.
You need to check the beading diameter of your Outwell to see what size it is.You can get Kador strips that are 6mm to 6mm or 6 to 4mm.
It's the most efficient way to connect a driveaway and you could also connect it to the other, non door, side of the van too (but not sure if that chanel is 6 or 4 mm.
This is the sort of thing I mean from the club shop. You can also get them from campervan /caravan outlets. Check the size you need before ordering online, remember you need 6mm for the wind out awning side.
https://vwcaliforniaclub.com/shop/p...awning-kit-6mm-to-6mm-4-metre-awxdrive-3dta16