Yes, that’s PHPMyAdmin’s .php config file, which sets internal variables used in PHP by the script.
I’m talking about the .conf file that contains apache directives related to PHPMyAdmin, referred to on these pages:
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How To Install and Secure phpMyAdmin on Ubuntu 20.04 | DigitalOcean
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ubuntu - phpmyadmin.conf and apache.conf missing - Stack Overflow
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https://www.linode.com/community/questions/16988/completing-install-of-phpmyadmin-on-centos-7
As I haven’t installed it myself in many years other than through this script, I don’t know firsthand, but they, and many others I saw, all say it should be there, which the other Virtualmin discussion I linked before https://forum.virtualmin.com/t/phpmyadmin-conf-file-for-virtualmin-webmin/107388/4 agrees with and says it looks like Virtualmin doesn’t install PHPMyAdmin the usual way.