For accessibility requirements, the required fields should add a red asterisk.

<label for="firstname">First name <abbr class="req" title="required">*</abbr>:</label>

I'd like to know if there is any option could help it.
If not, I'd like to request this feature.

As the articles below explained.
https://www.w3.org/TR/WCAG20-TECHS/H90.html#H90-ex2
https://vue-generators.gitbook.io/vue-generators/validation

Thanks.