No, Numista is a collaborative catalog similar to Wikipedia.
When the issuer exist you can add the new entry there, if it's missing that's something you would need the help of a catalog admin with.
But I think it already exists HERE but there also other Hesse lines.
At the bottom of every search there is a link to the form Add it yourself!
You can orientate yourself on existing pages like THIS.
A referee looks at it and if everything checks out with your creation request it gets published.