class AllRulesTest {

    @ArchTest
    static final ArchTests SOME_RULES = ArchTests.in(SomeRules.class);

    @ArchTest
    static final ArchTests OTHER_RULES = ArchTests.in(OtherRules.class);
}

(...)
<rules>
  <configurableRules>
      <configurableRule>
          <rule>package.AllRulesTest</rule>
      </configurableRule>
  </configurableRules>
</rules>
(...)

(...)
<rules>
  <configurableRules>
      <configurableRule>
          <rule>package.SomeRules</rule>
      </configurableRule>
      <configurableRule>
          <rule>package.OtherRules</rule>
      </configurableRule>
  </configurableRules>
</rules>
(...)

Grouping is ignored (rules referred to by ArchTests are not taken into consideration).

Grouping works via the plugin just as if run as a test directly.