unattended-upgrades conffile prompt

To enable unattended-upgrades for packages which can show dpkg config change menu, one has to configure apt and dpkg with these config options:

Dpkg::Options {
  "--force-confdef";
  "--force-confold";
};

These options should be added to a config fragment under /etc/apt/apt.conf.d; however, this will cause any apt-get upgrade command to not ask for config change selection.

My question is: does a method exist to enable --force-confdef --force-confold only for unattended-upgrades, short of modifying the systemctl apt-daily-upgrade.service unit file (ie: by adding a custom APT_CONFIG env var)? In other words, does exist a specific config file which is valid for unattended-upgrades only?

Note: I am using Ubuntu 20.04, but I expect this question to be relavant for Debian also.