Mini Jinja
MiniJinja is a powerful but minimal dependency template engine
...The project supports Jinja-style templates, inheritance, filters, expressions, dynamic objects, and serde-compatible data. It is designed to stay close to Jinja2 while keeping compile times, dependencies, and API surface manageable for Rust programs. MiniJinja can also be used as a small expression language or embedded template layer in larger applications. It is useful for configuration generation, HTML rendering, LLM chat templating, data workflows, and command-line templating.