sorry, you can't do that. but instead you can place the buttons in the dialog's button bar with appropriate --button arguments.
tail -n 100 -f /var/log/syslog | yad --plug 12345 --tabnum 1 --text-info --listen --tail &
tail -n 100 -f /var/log/kern.log | yad --plug 12345 --tabnum 2 --text-info --listen --tail &
yad --notebook --key 12345 --tab syslog --tab kern.log --tab buttons --button gtk-close \
--button "test1:logger first test" --button "test2:echo 'second test' | sudo tee /dev/kmsg"
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