Well, that’s a statement. You are not alone, but why didn’t you look into forum before writing this post? @anon82920800 described in detail how to use dsa… (link and also read the following posts).
But I totally second that there is no official documentation from team for it, which I deem the wrong way. And it is also the wrong way to always insist in referring to upstream documentation - this project was clearly promoted to deliver necessary documentation how-tos. And VLAN configuration definitely belongs to it…
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