在 VS Code 属性设置中找到 User Snippets，新建全局代码片段。

例如：创建名为 flask-jinja.code-snippets 自定义全局代码片段

{
	// Place your global snippets here. Each snippet is defined under a snippet name and has a scope, prefix, body and 
	// description. Add comma separated ids of the languages where the snippet is applicable in the scope field. If scope 
	// is left empty or omitted, the snippet gets applied to all languages. The prefix is what is 
	// used to trigger the snippet and the body will be expanded and inserted. Possible variables are: 
	// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. 
	// Placeholders with the same ids are connected.
	// Example:
	// "Print to console": {
	// 	"scope": "javascript,typescript",
	// 	"prefix": "log",
	// 	"body": [
	// 		"console.log('$1');",
	// 		"$2"
	// 	],
	// 	"description": "Log output to console"
	// }
	"gettext": {
		"scope": "html",
		"prefix": "_",
		"body": "{{ _('$1') }}",
		"description": "create a gettext code"
	},
	"variable": {
		"scope": "html",
		"prefix": "jv",
		"body": "{{ $1 }}",
		"description": "echo a variable"
	},
	"expression": {
		"scope": "html",
		"prefix": "js",
		"body": "{% $1 %}",
		"description": "echo a expression"
	},
	"url_for": {
		"scope": "html, python",
		"prefix": "url",
		"body": "url_for('$1')",
		"description": "echo a url_for()"
	},
	"if statement": {
		"scope": "html",
		"prefix": "if",
		"body": [
			"{% if $1 %}",
			"$0",
			"{% endif %}"
		],
		"description": "echo a if control structure"
	},
	"for statement": {
		"scope": "html",
		"prefix": "for",
		"body": [
			"{% for $1 in $2 %}",
			"$0",
			"{% endfor %}"
		],
		"description": "echo a for structure"
	}
}

编辑器输入 jv 就可以快速格式化一个 {{ $1 }} Jinja2 变量打印片段。