Do not replace all {{ ... }} blocks in documentation / ignore unknown variables?

I would like to use your plugin, but I run into the issue that my documentation already contains {{ ... }} blocks that should not be replaced by this plugin. This throws a whole list of "Not found value for variable ..." errors.

Maybe the simplest option would be a flag to not replace unknown variables, instead the "Not found value for variable ..." error? This could be opt-in such that the default behavior would stay the same.