It would be best to use an addon and customize the debuff display options in a way so that you're satisfied.
If you still want to do it with WA it's pretty easy to do actually.
Create a dynamic group with one aura in it, configure it in a way so that it triggers from Debuffs on the unit "player" then set it
on high cpu-scan and auto-clone. Now you can go to the display settings and do whatever you like with it.
Code:
dOZ3caGEve7Ia2gbntPQmBjDtPkoSOUnkUMuStvYEHDlY(ju(Panms53u6zsyOeQgmjQHlLoOevgNaoMqohHSqHQLQI0ILilxHhkrvpf5XQQNtXejrMkQMmknDQUOkuxvfYLv66QYgjP(MuzZkA7su6Jsumnb9zs13jqJuQQojjy0QOgVkOlPcClHYPj68KKLPs9xPk9AsOre4GYGdhKb0TaAcisarGyaXcIfCq6dRGGovHY0phuojzY(I4Gom4CAwhQJ1CxuiSRrRtuxxGcTqmJfwaAS6sBIRQDbXQkLzKF9H91csvW50SouhgqKMWIBTOMIOqrHHyglSbKPn)xCje0EyBoXUSioijliL2sV50asqjRFgQ7I66egDlQtuaHfnn3yglSbu6XWhsD9DyWveOZRu)Sd1HnAfc1cCh1vO1OfiaMXcfcYS1P4wzYb13XQ5GQ2ml4GEMT3FnBmOeOHTUGdI5vDj4WHdYZ1n5GdI5vDj4WHdAK)l4GyEvxcoC4WHd6doUIahKpK667aCq5NB)vBArCqSBP3CYv1UG6VCN2J6J6d0)zCltVNLSlixYSSGMVA18ZjehoO2HvFSgJ4J9lnsBcxAGQ2ml4Gg26coiMx1LGdhoipx3KdoiMx1LGdhoOr(VGdI5vDj4WHdh00MCsEYIR7iqSstBnRI88xrdOdAftzXuwmLpWaAS6sBIRQDbj)2eiJN)kAkVn5zzIztoOGhXjfu6yqNyTm4stGcqgp)v0iUvMCqXdY5b7bKKfKsBP3CAu4BtGspg(qQRVddUIa9T2kRvWekbhoOYIROWBn4aa
something like this. At some point this does get complicated, in case you want more customization. This aura should work but I'd still recommend using a complete addon.