Seeking efficient and scalable method for systematic annotation of genes to direct GO terms and their hierarchical parents

[alimotahharynia]

How can I systematically annotate each gene in Homo sapiens taxon to its direct Gene Ontology (GO) term and all its parent terms in a hierarchical manner? While I am aware that the obo file contains information such as "is a," "part of," and "regulates," it lacks a comprehensive hierarchy from child GO terms to all their parent terms. Is there an existing method available to achieve this systematic annotation, or do I need to develop a custom script to extract this information from the obo file? Any guidance or assistance regarding this issue would be greatly appreciated.

Kind regards,
Ali