These four tags seem to be identical with the ones found in 30D, but in different places. Only the two first ones decoded, but the two others below seem to be connected in one way.

7D
[MakerNotes] 0x026b Canon Color Data 4 0x026b : 167 FlashOutput
[MakerNotes] 0x026c Canon Color Data 4 0x026c : 158 FlashBatteryLevel
[MakerNotes] 0x026d Canon Color Data 4 0x026d : 6386
[MakerNotes] 0x026e Canon Color Data 4 0x026e : 913

1000D
[MakerNotes] 0x026b Canon Color Data 4 0x026b : 208 FlashOutput
[MakerNotes] 0x026c Canon Color Data 4 0x026c : 190 FlashBatteryLevel
[MakerNotes] 0x026d Canon Color Data 4 0x026d : 6280
[MakerNotes] 0x026e Canon Color Data 4 0x026e : 689

6D
[MakerNotes] Canon Color Data 7 0x0198 : 208 FlashOutput
[MakerNotes] Canon Color Data 7 0x0199 : 189 FlashBatteryLevel
[MakerNotes] Canon Color Data 7 0x019a : 6274
[MakerNotes] Canon Color Data 7 0x019b : 686

R6
[MakerNotes] Canon Color Data 10 0x0299 : 238 FlashOutput
[MakerNotes] Canon Color Data 10 0x029a : 182 FlashBatteryLevel
[MakerNotes] Canon Color Data 10 0x029b : 6234
[MakerNotes] Canon Color Data 10 0x029c : 665

I can't find anything for Canon EOS M5.

7D.zip

6D.zip

R6.zip