Genesys Cloud - Main

Looking for solution to Meta requiring variables in WhatsApp templates to be lower case only. Old templates have variable formatted like Genesys such as {{AGENT_ALIAS}} and then agent name is properly inserted in Genesys canned message. New WA templates require lowercase so only {{agent_alias}} and it doesn't work. Is there a way to do variable mapping in canned messages? I tried substitution but default value is text and literal value so {{AGENT_ALIAS}} in that field is what is literally populated in canned message field.