Any REST/SOAP APIs for fetching EFF metadata

Summary:

For making one of our PDH OIC Integrations more efficient, we are implementing a feature to leverage the ItemV2 API to fetch all the EFF for a given Item. The challenge is, we use the same Attribute Internal Name in our PDH Cloud and R12 PIM, so that we can easily map the attribute values from PDH to R12. The current API /fscmRestApi/resources/11.13.18.05/itemsV2/{itemsV2UniqID}/child/ItemEffCategory is providing the AttributeAPI Name, not the internal name.

Are there any APIs available to fetch the metadata of EFFS, so that we can query that periodically and map it with the Attribute API names.