Merging two lists of different length

Hi Guys,

I have a geometry with 274 curves. Each curve has a centre point (green points) and two "outer points" (blue points).

The centre points are in a list with a length of 274 lines while the outer points are in a different list of 536 lines

In the end I would like to merge these two list into one list such that I can select a certain curve controlling the three points on that curve (within the yellow circle).

Anyone an idea how to achieve this?

Thanks in advance!!