The DBMS_HYBRID_VECTOR package contains a JSON-based query API SEARCH, which lets you query against hybrid vector indexes.

• SEARCH
  Use the DBMS_HYBRID_VECTOR.SEARCH PL/SQL function to run textual queries, vector similarity queries, or hybrid queries against hybrid vector indexes.
• GET_SQL
  Use the DBMS_HYBRID_VECTOR.GET_SQL PL/SQL function to return the internal SQL query that is generated from the parameters.
• SEARCHPIPELINE
  Use the standard table function DBMS_HYBRID_VECTOR.SEARCHPIPELINE to return a pipeline of row records.