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I’m trying to find out if it’s possible to use HTML formatting, may not be even the full set but a limited set like line breaks and tabs in form help key.
I don’t think there is an OOTB way by using some config like contentIsEscaped
It seems you are trying to use it for help key in a custom form. If that’s the case, line break isn’t required as this is not something to be parsed as VTL, but to be considered as Java string. you can try \n if required.