I believe they are waiting on when the stories actually start to converge. At least I think that they know all the Marvel TV series are connected to each other to an extent but they are just focused on The Defenders Saga. I assume when we get AoS characters back, they will add the ABC series.
They had no problem on adding AoS to the Nick Fury collection when SI was about to be released. Marvel.com Nick Fury article also includes AoS info. And the ABC series are currently under the "Agents and Inhumans" group so I think Marvel knows they belong together. At some point they will add them to the timeline.