How to display thumb thumbnail in DLE in additional field?

Question

HTML

At the moment I have this:

<img  style="cursor: url(/engine/classes/highslide/graphics/zoomin.cur), pointer !important;" src="[xfvalue_kartinkatovara]" alt="" />

But the pictures are loaded huge, which affects the loading of the site and there are a lot of them (I pressed nowhere further)
I wanted to display it like this:

<img  style="cursor: url(/engine/classes/highslide/graphics/zoomin.cur), pointer !important;" src="[thumb][xfvalue_kartinkatovara][/thumb]" alt="" />

But as it turned out, the [thumb] tag simply does not work there and is displayed as it is ... on the [thumb] page, the picture [/thumb]