How to configure footnoteReturnLinks (on/off)?

It seems like blackfriday supports enabling/disabling [return] links on footnotes:

But this is actually a 0/1 bit in a flags value. I can’t tell if Hugo exposes controls to this.

I’ve tried disabling this in my config.yaml as:

  footnoteReturnLinks: false

also direclty on the root (because putting some blackfriday footnote* values to root actually works somehow):

footnoteReturnLinks: false

None worked. Is it possible to disable the return links?