Function parse_outputs 

pub fn parse_outputs(
    template: &Value,
    parameters: &BTreeMap<String, String>,
    resources: &Map<String, Value>,
    resource_physical_ids: &BTreeMap<String, String>,
    resource_attributes: &BTreeMap<String, BTreeMap<String, String>>,
    imports: &BTreeMap<String, String>,
) -> Result<Vec<TemplateOutput>, String>

Parse the template’s Outputs block into resolved entries. Each Value is fully resolved (Ref / GetAtt / Sub / Join / Fn::ImportValue) to a string. Imports use imports for cross-stack lookups.