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Unfortunately I think the simple answer is that you cannot do what you want with standard Vim (or NeoVim, which I also tested — although NeoVim is slightly more convenient in that you don't need to give the `-` argument to read from stdin).

Vim, like most text editors, is designed with the fundamental assumption that it is operating on a buffer of known size, rather than a stream of data which could be infinite in length. Once the input data is read, it is not read again unless you explicitly request another read operation with `:e` or similar. Although you can make Vim behave a bit like a pager using the `-` option, it is not really intended to be a replacement for `less` — it's more like a shortcut for `process > /tmp/somefile.txt; vim /tmp/somefile.txt`

Presumably in theory there's nothing to stop somebody from producing a modified version of Vim which has more pager-like features, although they'd need to consider how operations like "Go to the 50% position" would work in a potentially-infinite data stream (would this need to read the whole stream in order to find the true 50% mark, or just jump to 50% of the currently known data?)