Configuration of custom CA-bundle for mod_auth_openidc module in Apache HTTPD

Issue

• How to configure custom ca-bundle for mod_auth_openidc module to trust internal CA ?
• We are getting below errors when configuring internal CA for the mod_auth_openidc module.

[Mon Jul 20 2020] [auth_openidc:error] [client 10.10.10.10:65377] oidc_util_http_call: curl_easy_perform() failed on: https://example.com:8220/example/oauth2/access_token 
(Peer's certificate issuer has been marked as not trusted by the user.), referer: https://example.com:8220/login
[Mon Jul 20 2020] [auth_openidc:warn] [client 10.10.10.10:65377] oidc_proto_token_endpoint_request: error when calling the token endpoint (https://example.com:8220/example/oauth2/access_token), referer:
https://example.com:8220/login
[Mon Jul 20 2020] [auth_openidc:error] [client 10.10.10.10:65377] oidc_proto_resolve_code_and_validate_response: failed to resolve the code, referer: https://example.com:8220/login