It’s not feasible to display a SSRS report in the SharePoint online.
In my opinion, you could migrate SharePoint Sever 2013 to SharePoint Online, then replace SSRS with Power BI.
Power BI is a cloud-based suite of business analytics tools that lets anyone connect to, visualize, and analyze data with greater speed, efficiency, and understanding. It connects users to a broad range of live data through easy-to-use dashboards, provides AI-infused automated insights, embedded and interactive reports, and delivers compelling visualizations that bring data big and small to life.
References:
Microsoft 365 and Office 365 service descriptions - SharePoint service description
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