Several rel=canonical, so they get ignored

Hi,

I am using your plugin, and it will place rel=canonical in the code, but there is also one placed by WordPress, so Google will ignore all of them (see https://webmasters.googleblog.com/2013/04/5-common-mistakes-with-relcanonical.html)

Here are two example pages
https://bleistift.memm.de/2016/04/lamy-2000-mechanical-pencil/
https://bleistift.memm.de/2014/07/lamy-scribble/

What can I do so that only the canonical from your plugin is on the page and not the other one?

https://www.ads-software.com/plugins/canonical-seo-content-syndication/