Which hdmi arc cable for dolby atmos

[SaurabhK]

Hi
I have connected my lg oled c8 to a yamaha aventage 2070 through a Chord activ 1.4 hdmi on the arc outlets. While all is working fine it is not showing dolby atmos on the recoever. Even thiugh i have lcr only connected as of now would i need a higher speed cable 2.0 plus speeds to get true atmos ?

What cable would you suggest?

 

[SaurabhK]

Or is some particular setting required on the reciever. Cutrently playing on the Movie adventure mode with lcr settings