Since powermail 6.0. it's possible to add a link in a checkbox label (for GDPR) as per the docu:
It says:
Just use an option in your FlexForm like (with an example link to page 123 where the privacy terms are located):
I accept the <f:link.page pageUid="123">privacy terms</f:link.page> | privacy terms accepted
After that you have to enable html in labels (this feature is turned off for security reasons). Example TypoScript constants:
plugin.tx_powermail.settings.misc.htmlForLabels = 1
... yet it also says that '(this feature is turned off for security reasons)'.
What other options are there to accomplish this? (with no security loss?)