【feature request】distinguish icon with userdefined field in yaml

[ghost]

There is now the ability to customize icons based on tags, but sometimes user may need to map specific icons based on their difined filed in yaml,for example, i define a field "authors" in yaml, like "authors: tom, marry,bob" , but now i can not distinguish the icons in map by this information

[esm7]

I like the idea, will add it in the upcoming versions.