omxh265enc temporal identifier

Hi everyone,
Currently I am using Jetson TX2 to encode video stream; codec is omxh265enc.
As I knew, omxh265enc does not support encode B-frame, GOP structure is like this IPPPPPPP…
But I also want to know the “temporal identifier” of this GOP (which temporal sub-layer I-frame, P-frame is?). How can I got this information? Any suggestion is appreciated.
Thank in advance.
Best regards,

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