Adding additional extrusion to a raft (raft with a skirt?)
In Ultimaker Cura you can select only one of the the build plate adhesion options skirt, brim or raft. You cannot select multiple options. 

There is no option available in Ultimaker Cura to increase the outline count of the raft bed adhesion structure. Basically the raft exists of a line support structure as can be seen in the figure below.

The line around the lines should be considered "the skirt", so if the nozzle is not properly primed (not sufficient molten filament available), you need to properly prime the nozzle prior to printing.

To prime the nozzle, you need to add some extrusion of filament in your start G-code.

Personally, I like the style of Ultimaker where prior to printing, a puddle of filament is deposited priming the nozzle adequately. Basically you need to move to a position where you like to deposit filament:

 G1 X10 Y10 Z2


Then you need to extrude material

 G1 F125
 G1 E10
 G1 Z3 E5


After that you can even wipe the nozzle.

Another option (that requires some copy/pasting from your side and would not be a recommended practice) that is possible is slicing the model with a skirt (with a sufficient distance to stay away from the raft position) instead of a raft and look at the generated G-code and copy the skirt deposition codes into the raft G-code file. You do need to take care of the proper length of the extruder when the skirt followed by the raft, so you need to use G92 Exx.xx where xx.xx is the actual length of the filament start for the raft.