Amazon Work Mail DNS settings configuration

Hi,

we are currently using Google Workspace for our emails and and have the DNS settings (MX records etc) in our domain providers accordingly. We want to use Amazon Work Mail for a specific email only. We dont not want to transfer our complete domain to Amazon Work Mail. How do we achieve that? There is a Workmail Configuration MX and CNAME but that Amazon says will transfer all domain. I just tried to set the specific email MX, TX and CNAME but MX is giving error 'Invalid value'