How To Back Up Only WeChat Messages On iPhone 9?

Is it possible to access my iPhone 9 and back up only several WeChat messages that I need? Any suggestions would be really appreciated. Text a lot through WeChat and now get an alert that your storage is almost full? To receive new messages, you have to delete old ones. However, these text messages may record happiness and tears about your life, or they’re closely associated with your business. Once you delete these text messages, you will lose them forever. As a result, it's a necessity...