Multi Set in UE4 C++ to support duplicate items

I’m trying to use the Unordered Multi Set for my inventory system but can’t find the container in UE4 that’s the equivalent of the STL Unordered Multi Set in C++. I know there’s the TSet but it doesn’t support multiple values for a key (unique value for each key). Is there a way to approach this in UE4 ?

You could maybe use TMultiMap