请教各位大佬一个 mybatis plus 问题

    select
    sum(JOIN_COUNT) as 'joinNum',sum(WIN_COUNT) as 'winNum',sum(DEFRAY_COUNT) as 'writeOffNum'
    from mkplat_activity_point
    where
    activity_id = #{activityId}
    and
    point_id >= #{start}
    and
    point_id <![CDATA[<]]> #{end}

请问这种 sql 在 mp 里面除了 xml 还有啥办法吗，selectMaps 有点麻烦，返回值还要把 map 转为对应的对象，能不能直接通过 mybatis plus 返回一个 StatisticsCount 出来

    @Override
    public StatisticsCount count(String activityId, String start, String end) {
        QueryWrapper<ActivityPointDO> wrapper = Wrappers.query();
        wrapper.select("sum(JOIN_COUNT) as 'joinNum'","sum(WIN_COUNT) as 'winNum'","sum(DEFRAY_COUNT) as 
         'writeOffNum'").
                eq("activity_id",activityId).
                ge("point_id",start).
                lt("point_id",end);
        List<Map<String, Object>> maps = this.getBaseMapper().selectMaps(wrapper);


    }