proto3:一种在字段级添加元数据的方法

我的原始文件看起来像

syntax = "proto3";

package com.address;
option java_package = "com.address";


message AddressesMessage {
 int32 id = 1;
 string address_line_1 = 4;
 string address_line_2 = 5;
 string city = 7;
 string postal_code = 9;
 string country = 10;
}

插件正在为我生成类,但是现在我想在字段级别添加一些元数据信息。就像

syntax = "proto3";

package com.address;
option java_package = "com.address";


message AddressesMessage {
 int32 id = 1 [ (meta) = { isfact: false }];
 string address_line_1 = 4;
 string address_line_2 = 5;
 string city = 7;
 string postal_code = 9;
 string country = 10;
}

这可能吗?