Feature request: image link selector

Hey mate !

I am really loving your app, it is really good and convenient. Thanks :D

There are 2 things I think would be awesome to add, but I'll start with the simplest one: would you add a selector option for an image ?

The user would select the url, and you would add a tag in the rss feed for it. I'm not sure of the details, but if it helps politepol does it this way

<item>
  <title>
    TITLE
  </title>
  <link>LINK</link>
  <description/>
  <pubDate>Fri, 29 Jan 2021 22:41:51 -0000</pubDate>
  <guid isPermaLink="false">LINK</guid>
  <enclosure length="1000000" type="image/jpeg" url="IMAGE_URL"/>
</item>

while RSSHUB does it that way

<item>
  <title>
    TITLE
  </title>
  <description>
    <img src="IMAGE_URL" referrerpolicy="no-referrer">
  </description>
  <pubDate>Fri, 29 Jan 2021 22:42:09 GMT</pubDate>
  <guid isPermaLink="false">LINK</guid>
  <link>LINK</link>
</item>

Thanks again for the amazing app, and keep safe !