How to use replace in a "add a row" of google sheets block?

I would like to replace the extension “.com” extension from a URL received from a RSS feed by “.fr”.

Up to now, I receive the field “URL” from a RSS feed and want to save several fields of the RSS feed in a new row of a Google Sheet.

I have tryied several methods, with “=”, “{{}}”, ', ".

replace(5.source.url; .com; .fr)
replace(5.source.url; “.com”; “.fr”)
=replace(5.source.url; “.com”; “.fr”)
{{replace(5.source.url; “.com”; “.fr”)}}
{{replace(“{{” + 5.source.url + “}}”; “abs”; “pdf”)}}

I never got any good responses. I have received folllowing data of the google sheet cell:
no response
{{}}
ERROR!

What is wrong in my understanding of the “replace” method?

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