How can pongo2 does not escape chars which except TokenSymbols?

[mengying1995]

func main() {
	sfsLoader, err := pongo2.NewSandboxedFilesystemLoader(".")
	tplset := pongo2.NewSet("name", sfsLoader)
	tpl, tplErr := tplset.FromFile("create-table.sql.tpl")
	out, outErr := tpl.Execute(pongo2.Context{
		"table_settings": "SETTINGS merge_with_ttl_timeout = 86400, storage_policy = 's3'",
	})
	return out
}

create-table.sql.tpl:

CREATE TABLE IF NOT EXISTS db.table
(
    `name` String,
    `type` String,
    `help` String,
    `labels` Map(String, String) DEFAULT map(),
    `value` Float64,
    `timestamp` Int64
)
ENGINE = MergeTree
PARTITION BY toDate(fromUnixTimestamp64Milli(`timestamp`, 'Asia/Shanghai'))
PRIMARY KEY (`timestamp`, `name`)
ORDER BY (`timestamp`, `name`, `labels`)
-- SETTINGS
{% if (table_settings | default : "") == "" %}
SETTINGS merge_with_ttl_timeout = 86400
{% else %}
{{ table_settings }}
{% endif %}
;

out is:

...Omit
...Omit
-- SETTINGS
SETTINGS merge_with_ttl_timeout = 86400, storage_policy = \u0026#39;s3\u0026#39;
;

Why ' is escaped to \u0026#39; ? How can I avoid this?
Because SQL can not parse \u successfully and can not use ; again and again.

Thank you very much!