问为循环中的列表对象添加属性并返回此对象，但它未应用

EN

member.findAll({
    where:{
        isPartner:1
    }
}).then(partnerList => {
    for(let i = 0; i<partnerList.length; i++){
        const partner_no = partnerList[i].dataValues.no;
        partner.findAll({
            include: [{
                model: member,
                required: true,
            }],
            where:{
                partner_no : partner_no
            }
        }).then(myCustomers => {
            partnerList[i].dataValues.myCustomers = myCustomers.length;

        })
    }
    return partnerList;
}).then(partnerList => {
    res.render('partner/partners', {partnerList: partnerList})
})