im trying to create a chain certificate via openssl to create a chain certificate
That's the outcome I need to get

Certificate chain
 0 s:C = XX, ST = State , L = City, O = Provider, CN = domain.com
   i:C = US, O = DigiCert Inc, OU = www.digicert.com, CN = GeoTrust TLS RSA CA G1
 1 s:C = US, O = DigiCert Inc, OU = www.digicert.com, CN = GeoTrust TLS RSA CA G1
   i:C = US, O = DigiCert Inc, OU = www.digicert.com, CN = DigiCert Global Root G2
 2 s:C = US, O = DigiCert Inc, OU = www.digicert.com, CN = DigiCert Global Root G2
   i:C = US, O = DigiCert Inc, OU = www.digicert.com, CN = DigiCert Global Root G2

But the outcome i receive is:

0 s:C = XX, ST = State, L = City, O = Provider, CN = domain.com
   i:C = US, O = DigiCert Inc, OU = www.digicert.com, CN = GeoTrust TLS RSA CA G1
   a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256
   v:NotBefore: Feb 18 00:00:00 2022 GMT; NotAfter: Mar 14 23:59:59 2023 GMT
 1 s:C = US, O = DigiCert Inc, OU = www.digicert.com, CN = GeoTrust TLS RSA CA G1
   i:C = US, O = DigiCert Inc, OU = www.digicert.com, CN = DigiCert Global Root G2
   a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256
   v:NotBefore: Nov  2 12:23:37 2017 GMT; NotAfter: Nov  2 12:23:37 2027 GMT

In the outcome i want to get is not included rsa encryption but it's not important i have just the .key what i know how to include.

The files what i have are:

Root.crt

Intermediate.crt

Domain.crt

AS.key

I was able to only create a 2 part chain and i need to create a 3 part chain node.

I really appreciate your help.