As I said earlier, just posting my virtual tags is useless since they probably won't work in somebody else's installation.
So here are some more general comments that might explain things a bit.
box 1:
It's a virtual tag that will look for things such as genre category, the presence of work levels, composers, conductors, artists.
For classical releases that contain works/compositions from different composers, and for non-classical releases I will usually have it simply displaying: Album Artist - Album
Like this:

If there is only a single composer for the whole release, the virtual tag will try to list:
Composer, Conductor, Orchestra (ensemble), Featured Artist(s)
'Featured Artist' is a custom tag that I use for what I consider a main performer on a release.
It could be the main vocalist in an opera that I am personally interested in, or the cellist that plays the solo part in a large orchestra.
I have Picard pre-populating that field by using a certain script, but it will usually need some manual editing before I accept it as 'my' featured artist.
B.t.w., I also use that tag for non-classical music, for where I a consider one performer in a band the main artist that I am interested in.
Ensemble/Orchestra is also a custom tag, but it gets populated automatically by Picard and it's Classical Extras plugin and it hardly needs any attention or interaction.
box2:
The sub-grouping field is also a dynamic virtual tag.
It will take into account what content is already displayed in the grouping header. (since that won't need to be repeated)
For multi-level works from one composer it will usually display the name of the acts or scenes from the top level work.
For a compilation album it might display the different composers and their works.
If a release is either: very simple, very complicated, or was not matched at MusicBrainz, I can simply disable the sub-grouping mechanics and have all information displayed in the title field. (also a virtual tag)
That could look like this:

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About the symbols:
In principle these symbols are just characters such as numbers and letters. But the font that you use will determine the availability of such decorative symbols.
Here are two examples of fonts that contain a lot of useful symbols:
http://www.kreativekorp.com/charset/font/SegoeUISymbol/http://www.kreativekorp.com/charset/font/SegoeMDL2Assets/And here is a simple example of how you could use such symbols in a virtual tag:
<Composer>{font: Segoe UI Symbol;Regular;9} 𝄞 {font: Segoe UI;Regular;9}<Work>{font: Segoe UI Symbol;Regular;9} 👤 {font: Segoe UI;Regular;9}<Artist>
I hope this gives you some more clues and amunition to proceed with your quest?