How to animate svg background?

Question

SVG

How to fill svg not with stroke, but with fill? it is necessary that the svg on the link is smoothly filled with color from transparent to white. It should look like a loader to the site, like this semicircle comes from nowhere. That is, not a fade effect, but as if the loader is loading.
I already use the anime.js library to work with other svg, maybe you can do it like this, I didn’t find it in the dock (