Try to revive this post, as we are facing the same issue. We are looking for a solution so that we can organize the Term in hierarchical way, but in the meantime looking for a way to add key/value pairs into it. To maintain information in a hierarchical way, I believe Category/Term is the best to achieve that, however, it is lacking the possibility that we can add key/value to the Term, and also we cannot assign Category to the entity as well. Could anyone had faced same issue before provide a direction? Thanks.
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