Open Source Annotation Tools for spaCy's Entity Linker?

According to the Tutorial Training a custom ENTITY LINKING model with spaCy (20:33) this is the training data format for spaCy's Entity Linker:

TRAIN_DATA = (Emerson was born on a farm in Blackbutt, Queensland., {links: {(0, 7): { Q312545: 1.0 }}})

My search for open source annotation tool is not successful. Do you know an open source/free annotation tool for this format?

Topic entity-linking spacy

Category Data Science

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