Iis rewrite from file.jpg to file.jpg.webp

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C#

IIS10

So the site content has file.jpg and needed to be rewritten to file.jpg.webp. Is it possible to use write and if so is this correct? Because I am not seeing the results

What I have tried:

<rewrite>
<rules>
<rule name="webp">
<match url="(.+)\.(jpe?g|png)$" ignorecase="false">
<conditions logicalgrouping="MatchAll">
<add input="{HTTP_ACCEPT}" pattern="image/webp" ignorecase="false">
<add input="{DOCUMENT_ROOT}/{R:0}.webp" matchtype="IsFile">

<action type="Rewrite" url="{R:0}.webp" logrewrittenurl="true">
<servervariables>
<set name="ACCEPTS_WEBP" value="true">



<outboundrules>
<rule name="Set Vary header" precondition="IsWebp">
<match servervariable="RESPONSE_Vary" pattern=".*">
<action type="Rewrite" value="Accept">

<preconditions>
<precondition name="IsWebp">
<add input="{ACCEPTS_WEBP}" pattern="true" ignorecase="false">