Yes It is.
I just need certificate for my subdomain (promis2.laophenixconsulting.com)
For my acme client I want to stay with the one located in /opt/bitnami/letsencrypt/accounts
So according to that I understand, I should have this configuration:
SSLEngine on
SSLCertificateFile "/opt/bitnami/apache2/conf/promis2.laophenixconsulting.com.crt"
SSLCertificateKeyFile "/opt/bitnami/apache2/conf/promis2.laophenixconsulting.com.key"
That's why some devices keep using the DST Root CA X3 ?