sure its very easy, just add the complete yaml in your secret, and import it like you would do with a regular !include, only now with !secret:
# in gauge card:
segments: !secret gauge_segments_battery
# in secrets.yaml
gauge_segments_battery:
- from: 0
color: '#FF453A'
- from: 2.5
color: '#FF4C34'
- from: 5
color: '#FF542E'
- from: 7.5
color: '#FF5C28'
- from: 10
color: '#FF6422'
- from: 12.5
color: '#FF6C1D'
- from: 15
color: '#FF7317'
- from: 17.5
color: '#FF7B11'
- from: 20
color: '#FF830B'
- from: 22.5
color: '#FF8B05'
- from: 25
color: '#FF9300'
- from: 27.5
color: '#FF9D00'
- from: 30
color: '#FFA700'
- from: 32.5
color: '#FFB200'
- from: 35
color: '#FFBC00'
- from: 37.5
color: '#FFC700'
- from: 40
color: '#FFD100'
- from: 42.5
color: '#FFDB00'
- from: 45
color: '#FFE600'
- from: 47.5
color: '#FFF000'
- from: 50
color: '#FFFB00'
- from: 52.5
color: '#F4F709'
- from: 55
color: '#EAF313'
- from: 57.5
color: '#DFEF1C'
- from: 60
color: '#D5EB26'
- from: 62.5
color: '#CAE72F'
- from: 65
color: '#C0E339'
- from: 67.5
color: '#B5DF42'
- from: 70
color: '#ABDB4C'
- from: 72.5
color: '#A0D755'
- from: 75
color: '#96D35F'
- from: 77.5
color: '#8DCD5C'
- from: 80
color: '#85C85A'
- from: 82.5
color: '#7DC357'
- from: 85
color: '#75BE55'
- from: 87.5
color: '#6DB953'
- from: 90
color: '#64B450'
- from: 92.5
color: '#5CAF4E'
- from: 95
color: '#54AA4B'
- from: 97.5
color: '#4CA549'
- from: 100
color: '#44A047'