There are 3 “certificates” here.
- is the “servercert.crt” in your above example - this is the domain certificate
- is the “aChainOrFullchainDependingOnApacheVersion.crt” which is the intermediate or chain file
- is the root CA certificate.
See also https://letsencrypt.org/certificates/
The intermediate certificate ( which is placed in the apache config) is obtained at the same time as you obtain the domain certificate. i.e via certbot if you are using that client.
There is a set of the public keys for certs your centos will trust in /etc/ssl/certs/ca-bundle.crt ( typically) which enables it to trust the root cert ( on a server) and most applications would utilise this. Your web browser, other application on your PC will have a similar set of public keys for root certs it will trust.
I’m a little concerned that you don’t understand the basics yet you want to change things that you don’t appear to understand.
I’ve also asked every time, but you never answer “what is that specific application?”. Without that I can not help.