Limited GOP settings on Adobe Media Encoder/Premiere Pro?

Hey creative peeps,

I am currently producing a video for tv broadcasting purpose in Singapore. The local media company requires that all submitted videos to be in the following format:

With the help of the Adobe community forum (Huge thanks to past contributors!) I've managed to set my Adobe programme to output these, except for the GOP length in which the media company asked for 12 (M=3, N=12). In my Adobe Media Encode/Premiere Pro, I don't see the option of setting it. The most I could do is just ticking the two options below:

I saw from some other forums that ticking the two would fulfill the M=3, N=12 requirement. Can anyone confirm on this?

Also, when I rendered my work into an XMF file and viewed it on mediainfo, it was stated that my GOP format settings is "variable".

Any Adobe gurus here willing to shed some light on this?

Thanks in advance.