Is it possible to use an image digest instead of a tag?

Hi, thanks for this nice chart and your Minecraft container work.

I tried to setup a server and didn't want to use an image tag instead i want to use a digest, to fix the image version. I tried this:

values.yaml
image: 
   tag: sha256:2888e7304b837002fade0b7c939c1b2297d303d3cba891805d12c13036d8aae2

But the result is something like this:

 image: itzg/minecraft-server:sha256:2888e7304b837002fade0b7c939c1b2297d303d3cba891805d12c13036d8aae2

Which does not work the resulting string should look like this.

 image: itzg/minecraft-server@sha256:2888e7304b837002fade0b7c939c1b2297d303d3cba891805d12c13036d8aae2

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