this is the command i used :
keytool -importkeystore -deststorepass aircontrolenterprise -destkeypass aircontrolenterprise -destkeystore /usr/lib/unifi/data/keystore -srckeystore /le-ssl/letsencrypt/live/yourdomain.com/privkey.pfx -srcstoretype PKCS12 -srcstorepass “” -srcalias 1 -destalias unifi -noprompt
passed a new path to the docker for /le-ssl as describe in the swag documentation " Using certs in other containers"
just need to restart …