where good_morning.yaml and good_bye.yaml are both macros e.g.
{%- macro bye() -%}
{{ "Bye bye! " ,
"See you later! ",
"cheerio! ",
"have a good day! ",
"thank you for listening, I'll be back tomorrow! ",
"Have a nice day! "] | random }}
{%- endmacro -%}
{{- bye() -}}
It replaces the line with the contents of the include (albeit the replacement may be multiple lines), BUT you can only replace that line and only use one include per line.