Emails on iCLoud
Years of Gmails saved on my computer use up 37GB. How can I move and save them to the Cloud to free up storage space on my macbook? After that, will I still be able to use the Mail app on my laptop?
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Your iCloud storage space won't be reduced even you move mails from gmail account to iCloud account in apple mail application ( IMAP account ) Move or copy emails between mailboxes in Mail on Mac - Apple Support
You kave to reduce mail storage Free up storage space for email accounts in Mail on Mac - Apple Support
Also reduce iCloud storage Manage your iCloud storage - Apple Support
Downgrade or cancel your iCloud+ plan - Apple Support