PatternSyntaxException: Illegal character

I want to set the requestTemplate header value to an array, but an error occurs

public class FeignConfig implements RequestInterceptor {
    @Override
    public void apply(RequestTemplate requestTemplate) {
            requestTemplate.header("roles", "{\"roles\":[\"default-role\"]}");
        }
    }
}

java.util.regex.PatternSyntaxException: Illegal character range near index 10
["default-role"]
          ^
	at java.util.regex.Pattern.error(Pattern.java:1957)
	at java.util.regex.Pattern.range(Pattern.java:2657)
	at java.util.regex.Pattern.clazz(Pattern.java:2564)
	at java.util.regex.Pattern.sequence(Pattern.java:2065)
	at java.util.regex.Pattern.expr(Pattern.java:1998)
	at java.util.regex.Pattern.compile(Pattern.java:1698)
	at java.util.regex.Pattern.<init>(Pattern.java:1351)
	at java.util.regex.Pattern.compile(Pattern.java:1028)
	at feign.template.Expression.lambda$new$0(Expression.java:35)
	at java.util.Optional.ifPresent(Optional.java:159)
	at feign.template.Expression.<init>(Expression.java:35)
	at feign.template.Expressions$SimpleExpression.<init>(Expressions.java:106)
	at feign.template.Expressions.create(Expressions.java:86)
	at feign.template.Template.parseFragment(Template.java:218)
	at feign.template.Template.parseTemplate(Template.java:202)
	at feign.template.Template.<init>(Template.java:61)
	at feign.template.HeaderTemplate.<init>(HeaderTemplate.java:110)
	at feign.template.HeaderTemplate.create(HeaderTemplate.java:72)
	at feign.RequestTemplate.lambda$appendHeader$3(RequestTemplate.java:758)
	at java.util.Map.compute(Map.java:1093)
	at feign.RequestTemplate.appendHeader(RequestTemplate.java:756)
	at feign.RequestTemplate.header(RequestTemplate.java:726)
	at feign.RequestTemplate.header(RequestTemplate.java:694)
	at com.commercial.consumer.config.FeignConfig.apply(FeignConfig.java:20)
......

How can I set it up so that it can work ?

Start with feign.RequestTemplate.header and follow the stack through HeaderTemplate, Template, Expressions, and Expression.java. Reproduce the array-valued header example and determine how the template parser handles the header value. Done means the reported value can be supplied without PatternSyntaxException, with the expected header content preserved.