Writer into file why awaly change my format?

[xiahuaxiahua0616]

My yaml config format is

names:
robot: ['AGV_001']
dock: ['KFR50']
cnc: ['1A01', '1A02']

then use viper set and writerfile result is
names:
cnc:
- 1A01
- 1A02
dock:
- KFR50
robot:
- AGV_001
changed my format, that's not want to wanted