请问flutter版本的jmessage 的getHistoryMessages接口返回的消息字段没有消息已读字段吗？

请问flutter版本的jmessage 的getHistoryMessages接口返回的消息字段没有消息已读字段吗？

版本: 2.1.6

{"id":"7","serverMessageId":"12538138432","isSend":true,"from":{"type":"user","gender":"male","username":"1","appKey":"2","nickname":"1","avatarThumbPath":"","birthday":"1970-01-01","region":"","signature":"无","address":"","noteName":"","noteText":"","isNoDisturb":false,"isInBlackList":false,"isFriend":false,"extras":{}},"createTime":1632791727846,"extras":{},"target":{"type":"user","gender":"male","username":"2","appKey":"2","nickname":"2","avatarThumbPath":"","birthday":"1970-01-01","region":"","signature":"无","address":"","noteName":"","noteText":"","isNoDisturb":false,"isInBlackList":false,"isFriend":false,"extras":{}},"type":"text","text":"11"}