{{ CTX.firstname | capitalize }}
Result: Capitalizes the first character of the input variable. If firstname is "john", it'll become "John"
{{ CTX.firstname | lower }}
Result: Lowers the entire variable. If firstname is "jEnnIfer", it'll become "jennifer"
{{ CTX.firstname | upper }}
Result: Capitalizes the entire variable. If firstname is "jeremy", it'll become "JEREMY"
{% hint style="info" %} For more, see list-of-jinja-filters.md {% endhint %}