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There just not a function out of box. this is known by microsoft and they recommend the other way around.
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I DO NOT WANT to create a new calendar on Sharepoint site and sync it to Outlook. I know this works. But don't want that<br />
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I want the other way, where I have a Outlook calendar on Exchange Online Outlook and then I want to show it as a web part on Sharepoint online.<br />
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Is that possible out of the box
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I DO NOT WANT to create a new calendar on Sharepoint site and sync it to Outlook. I know this works. But don't want that

I want the other way, where I have a Outlook calendar on Exchange Online Outlook and then I want to show it as a web part on Sharepoint online.

Is that possible out of the box

How to display exisitng O365 based Outlook calendar on Sharepoint Online site

Microsoft Sharepoint is a software platform and family of software products used for collaboration and web publishing combined. These capabilities include developing web sites, portals, intranets, content management systems, search engines, wikis, blogs, and other tools for business intelligence and collaboration. SharePoint has a Microsoft Office-like interface, and it is closely integrated with the Office suite.

Microsoft SharePoint

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

IT Administration is the processes and best practices for programming and development, and incorporates methodologies for managing activities and projects. Common methodologies include waterfall, prototyping, iterative and incremental development, spiral development, rapid application development, extreme programming and various types of agile methodology. The life-cycle "model" is a more general term for a category of methodologies, and a software development "process" a more specific term to refer to a specific process chosen by a specific organization.