Activate firmware retraction in your slicer.
Activate firmware retraction in klipper by adding this to you printer.cfg :

[firmware_retraction]
retract_length: 0.8
retract_speed: 60
unretract_extra_length: 0
unretract_speed: 60

Slice the test.
Print it and at the start of the print execute this command in the terminal :
TUNING_TOWER COMMAND=SET_RETRACTION PARAMETER=RETRACT_LENGTH START=0 FACTOR=0.05

this test will test retract length from 0 to 5, watch your console for what your current retraction is. 

CALC: “retraction = start + measured_height x factor.”
CALC: retraction=0+measured_height x 0.05.

make sure slicer generate G10, G11 code. I switched to slic3r and enabled 'Use firmware retraction' at printer setting.

in cura 5.0.0 install the printer settings module extension. then turn on firmware retraction. set you must have normal retraction turned on and above 0.0 for retraction to actually be put into your gcode.