use own script:
export KAS_Login="user" export KAS_Authdata="pw" export KAS_Authtype="plain" /usr/lib/acme/client/acme.sh --issue --server letsencrypt --dns dns_kas -d openwrt.domain.eu /usr/lib/acme/client/acme.sh --install-cert -d openwrt.domain.eu \ --key-file /etc/uhttpd.key \ --fullchain-file /etc/uhttpd.crt \ --reloadcmd "/etc/init.d/uhttpd reload"
doku: https://openwrt.org/docs/guide-user/services/tls/acmesh