Nikon Z 8 Reference Manual page 220

Flash Data
Displayed only if photo was taken with optional flash unit (
1
Flash type
2
Remote flash control
3
Flash mode (
Picture Control/HLG data
1
Picture Control (
HLG Picture Control (
HLG quality (
1 The items displayed vary with the Picture Control in effect when the picture was taken.
2 Shows the selected mode and fine-tuning value.
1
2
3
4
393)
0
1
2
3
1
175)
0
1
442)
0
525)
0
387,
0 0
4
Flash control mode (
Flash compensation (
2
Skin softening (
3
Portrait impression balance (
220
398).
391)
0
395)
0
454)
0
0
Photo Information
2
455)