Missing documentation about how call .xlvals varibale on other yaml files

[anisbenali]

Version XLD 9.5
Following your documentation https://docs.xebialabs.com/v.9.5/xl-deploy/how-to/manage-values-devops-as-code/#using-values-in-your-yaml-files
we can not find any indication of how to use .xlvals !
Synthax of how we can call variables found on .xlvals in other yaml files ?
Please help or improve documentation
Regards
Anis