It depends on how far you need to extend the array. If it's less than the length of a single segment you should be able to do this using the left or right padding values. You can do this either by Using a Conditional operator so that you're only editing the padding of the first segment, as shown in this graph:
Alternatively you could add the segments to the start/end input:
In either case the padding can't exceed the size of the segment, so another solution is to use a larger segment for the first/last position if possible.
I've attached these in a sample file. I hope that helps.