Template: hide symbols if some tag value is blank

[esv]

For templates (e.g., for customizing tooltips) I'd like to be able to hide some separators if the values they separate are empty
For example, currently

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{Tag status} | {Rating} | {Color label}

shows as

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[] | |

when all fields as empty

I'd like to "tie" the "|" symbols to the previous values and don't show them if those values are blank, so for example, if I enter the following mock template

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{Tag status}{≠∅" | "}{Rating}{≠∅" | "}{Color label}

(where {≠∅" | "} means "if the previous tag is not empty, print this string)
I'd get this nice empty field (without any newlines as well, though that would require some other templating feature)

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[xnview]

Do you have tried

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(({Tag status} | ))(({Rating} | ))(({Color label}))

[esv]

No I haven't, I didn't know it existed, where is this documented?

so from testing this

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t{Tag status} | r{Rating} | c{Color label}
((t{Tag status} | ))((r{Rating} | ))((c{Color label}))

get

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t[] | r | c
t[] |

Good news is that the Rating/Color tags seem to disappear, but the status remains
Also, is there a similar trick for the newline char? Can I completely remove the line if it's empty, something like this doesn't seem to work, I always get a newline

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(((((r{Rating} | ))((c{Color label}))<br>))