Can I add a table in a custom module?

Yes! Droptables is built to be used in every WYSIYG editor field, you just need to have content plugin to be called. Most of the time it's activated by default. It's not the case in the Joomla HTML custom module, you need to activate it. In the option tab you need to set the option Prepare content to Yes.

我可以在自定义模块中添加表格吗？

是!

Droptables旨在用于每个所见即所得编辑器字段，您只需要调用内容插件即可。大多数情况下它是默认激活的。
Joomla HTML 自定义模块中并非如此，您需要激活它。