scrapy get tag a attribute values of rel

types of tags a:

<a rel="sponsored" href="https://cheese.example.com/Appenzeller_cheese">Appenzeller</a>

or

<a rel="ugc" href="https://cheese.example.com/Appenzeller_cheese">Appenzeller</a>

and one or more of the following values:

rel="sponsored"
or
rel="ugc"
or
rel="ugc nofollow noreferrer"

Apparently, Scrapy only supports the following value (Just "nofollow"):

<a rel="nofollow" href="https://cheese.example.com/Appenzeller_cheese">Appenzeller</a>

How can I get other values (like: ugc, noreferrer and … ) with the help of Link Extractors?