Email validation for createAll method

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Hi All,
the documentation of loopback 4 does not contain validations for createAll method at interceptors. Can anyone guide me on how do we validate for createAll method?

const validateOrder: Interceptor = async (invocationCtx, next) => {

console.log('log: before-', invocationCtx.methodName);

const order: Order = new Order();

if (invocationCtx.methodName == 'create')
Object.assign(order, invocationCtx.args[0]);

else if (invocationCtx.methodName == 'updateById')
Object.assign(order, invocationCtx.args[1]);

if (order.orderNum.length !== 6) {
throw new HttpErrors.InternalServerError('Invalid order number');
}

const result = await next();
return result;
};

Start with the interceptor example in the issue and the LoopBack 4 documentation for create, updateById, and createAll. Determine how createAll arguments are exposed to an interceptor and document the validation approach and expected behavior. Done means the documentation clearly explains how to validate email values for createAll.

Written by the indexing model from the issue text.