SequelizeJS: How to include association (join) across multiple databases without using raw query

Question

Suppose, there is "Account" table in DB "A", and there is "ConversationHistory" table in DB "B".

My pseudo initialized script is:

// Connection Script
var db1 = new Sequelize("A", user, password)
var db2 = new Sequelize("B", user, password)

// Association
Account.hasMany(ConversationHistory, {foreignKey: "sender_id", as: "conversations", constraints: false})
ConversationHistory.belongsTo(Account, {foreignKey: "sender_id", as: "sender", constraints: false});

// But when I use include in findMethod like
ConversationHistory.findAll({
      where: {
         ...
      },
      include: [{
          model: Account,
          where: { userId: userId },
          as: "sender"
      }]
    })

and the result of this findAll is an error about cannot find Account table on database "B" (it implicitly uses B.Account and B.ConversationHistory, but I want to use A.Account, instead).

Is it possible to join across multiple databases without using raw query ? I have searched the option on the SequelizeJS docs, but cannot find how to do it :(

Thank you.