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unfortunately, that's not possible.
In any case, the Non-CDB will end up as a PDB in a CDB.
However, you can "reuse" the existing datafiles by plugging in the Non-CDB as a PDB
You'll find more information on migrating a Non-CDB -> PDB in the following MOS-Notes
- MOS-Note: How to Convert Non-CDB to PDB (Doc ID 2288024.1)
- How to Convert Non-CDB to PDB Database in 12c - Testcase (Doc ID 2012448.1)
and in the documentation (Administrator’s Guide):
- 9.3 Adopting a Non-CDB as a PDB : https://docs.oracle.com/en/database/oracle/oracle-database/19/multi/plugging-in-a-pdb.html#GUID-EE58804F-A999-4F7C-93DE-D641B3C1047B