Add a new font to font list : match corporate design system with internal mailings

External fonts are ignored by main webmails, but we use listmonk for internal mailings and the fonts we want to use are installed on internal devices.
As our corporate design system use this font we would like to use it for our internal mailings.

The design system with fonts is already online in static folder : is there a way to make the font appear in listmonk font list ?

NB : I understand it's a quite specific need, but there may exist listmonk users who use this app for internal mailings too ?