Animation as parameter inside animgraph?

How can I have animation as a parameter inside the animgraph? Let’s say I want to blend between two animations (Idle and Attack), but one of them must be dependent on whether the player is using a 1 hand or 2 hand sword (so the idle must be a parameter) When I drag from the blend I can only select specific animations inside content browser, rather than create some variable

See picture. How can I make the one marked in red a parameter? So I don’t have to create a blend for every single attack