Hi @Sehar Shahzad
Per my test, you can create a Modal Popup in spfx and display the page in modal.
You can refer to the following code to create a modal popup
https://www.c-sharpcorner.com/article/modal-popup-in-spfx/
Then you can display the page in the modal by following code
<div class="modal-content"><span class="close">×</span><iframe height="100%" src="url" width="100%"></iframe></div>
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