docs: Add import option

website/docs/cli/generate.mdx

@@ -45,6 +45,17 @@ Config path. Default to `kosko.toml` in current folder.
 
 Environment name.
 
+### `--import`
+
+<AvailabilityInfo availability={{ kosko: "4.2.0" }} />
+
+Preload ES modules at startup. Modules set in config file are also imported. This option only works when ECMAScript modules (ESM) is enabled.
+
+```shell
+# Using TypeScript
+kosko generate --import tsx
+```
+
 ### `--loader`
 
 <AvailabilityInfo availability={{ kosko: "3.0.0" }} />
@@ -58,7 +69,7 @@ kosko generate --loader ts-node/esm
 
 ### `--require, -r`
 
-Require external modules. Modules set in the config file will also be required.
+Require CommonJS modules. Modules set in the config file will also be required.
 
 ```shell
 # Using TypeScript

website/docs/configuration.mdx

@@ -54,6 +54,17 @@ Extension names of components. It's unnecessary to manually set this option. It
 extensions = ["js", "json"]
 ```
 
+### `import`
+
+<AvailabilityInfo availability={{ kosko: "4.2.0" }} />
+
+Preload ES modules at startup. This option only works when ECMAScript modules (ESM) is enabled.
+
+```toml
+# Using TypeScript
+import = ["tsx"]
+```
+
 ### `loaders`
 
 <AvailabilityInfo availability={{ kosko: "3.0.0" }} />
@@ -69,7 +80,7 @@ loaders = ["ts-node/esm"]
 
 ### `require`
 
-Require external modules.
+Require CommonJS modules.
 
 #### Examples {#global-require-examples}