It seems there is no mapping documented per:

StartSNMPPollers=1

in containers:
https://hub.docker.com/r/zabbix/zabbix-server-pgsql
https://hub.docker.com/r/zabbix/zabbix-server-mysql
https://hub.docker.com/r/zabbix/zabbix-proxy-mysql
https://hub.docker.com/r/zabbix/zabbix-proxy-sqlite3

But mapping seems to be implemented technically:
https://github.com/zabbix/zabbix-docker/blob/4d67975f5cba0d186d7cf10c9c81d53081e0a644/Dockerfiles/proxy-mysql/alpine/docker-entrypoint.sh#L445

Kindly add ZBX_STARTSNMPPOLLERS to the containers documentation.