Efficient way to split a DB into 2 or multiple DB based on key range?

Is there an existing function or logic to split one DB into 2 or more DB based on the key range?

For example, the current DB key range is [0, 1000]. To split the DB into 2 small DBs with a balanced space size, the 2 new DB may be [0, 420] and [430, 1000] (say each contains 200 KV-pairs).

Theoretically, we just need to split at most 1 SST file in each level if it is a 2-DB split. Other SST files can be a trivial move.