Per my research, Exchange OnLine Plan 2 will not add additional storage to SharePoint Online.
If you want to add storage space for your subscriptions about SharePoint, please refer to:
Currently, Office 365 Extra File Storage is available for the following subscriptions:
- Office 365 Enterprise E1
- Office 365 Enterprise E2
- Office 365 Enterprise E3
- Office 365 Enterprise E4
- Office 365 Enterprise E5
- Office for the web with SharePoint Plan 1
- Office for the web with SharePoint Plan 2
- SharePoint Online Plan 1
- SharePoint Online Plan 2
- Microsoft 365 Business Basic
- Microsoft 365 Business Standard
- Microsoft 365 Business Premium
- Microsoft 365 E3
- Microsoft 365 E5
- Microsoft 365 F1
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