Tested on October 10, 2024, Jira 9.12.8, ScriptRunner 8.33.0, Multi-Level Cascading Select 7.0.2.
It is possible to configure Multi-Level Cascading Select fields in a Cloud instance by importing options from a CSV file. The file should follow the same format as the following:
In the MLCS Cloud app, go to Import CSV (BETA) and choose the CSV file to import, then click Import.