There is no official plans for adding that third party glossary plugin into Confluence Cloud, based on your feedback I created the following feature request:
With the above you and any other user can that come to this post can vote up for the ticket and add it's thoughts to increase the relevance.
There is a recently released glossary add-on for the cloud version of Confluence.
It is not completely identical to the glossary add-on for confluence server, but the core features of the add-ons are similar. Technical terms can be managed in a glossary per space and during reading a page they can automatically be looked up together with their definitions. When looking for a definition of a specific term you can also search across all glossaries.
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