[2020] How do you start the raid missions with jericho?

Once you have completed the "No Way Out" mission and have spoken to Jericho in Erewhon, you will be able to start those missions from the new Raid sub section on the objectives board.

One of the first missions [I think the second one to be precise]
YT video for reference [contains spoilers if you haven't played it yet]: https://www.youtube.com/watch?v=0aMbq2XbOV0