Question about enabling OpportunitySplit when creating scratch org:

Hello guys, I'm currently using a script to create scratch org and also deploy metadata into the newly created scratch org. Recently, couple of custom fields were added to OpportunitySplit object, but those metadata can't be deployed to the new scratch orgs because OpportunitySplit isn't enabled by default. I've tried CLI commands / modifying settings attribute in project-scratch-def.json, but to no avail.

My understanding is that the only current option for enabling OpportunitySplit is via GUI. Is this correct? If there's any other way, please let me know.

Thanks in advance,

Lee