/usr/share/syslog-ng/ is in syslog-ng-core 3.5.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/syslog-ng/include/
/usr/share/syslog-ng/include/scl/
/usr/share/syslog-ng/include/scl/pacct/
/usr/share/syslog-ng/include/scl/pacct/plugin.conf
/usr/share/syslog-ng/include/scl/rewrite/
/usr/share/syslog-ng/include/scl/rewrite/cc-mask.conf
/usr/share/syslog-ng/include/scl/syslogconf/
/usr/share/syslog-ng/include/scl/syslogconf/README
/usr/share/syslog-ng/include/scl/syslogconf/convert-syslogconf.awk
/usr/share/syslog-ng/include/scl/syslogconf/plugin.conf
/usr/share/syslog-ng/include/scl/system/
/usr/share/syslog-ng/include/scl/system/plugin.conf
/usr/share/syslog-ng/include/scl/system/tty10.conf
/usr/share/syslog-ng/xsd/
/usr/share/syslog-ng/xsd/patterndb-1.xsd
/usr/share/syslog-ng/xsd/patterndb-2.xsd
/usr/share/syslog-ng/xsd/patterndb-3.xsd
/usr/share/syslog-ng/xsd/patterndb-4.xsd