I would need to update the content of an existing SharePoint site.
I can do it with an HTTP Request, in case if the site is Web Part type of page.
But I don't know how could I do it in case of a Wiki Page type of page.

I can get the content of the page with the below flow.

And the content of the variable is:

Could you please tell me what should be the content of the HTTP Request that I could use to modify the content of the wiki page?