Maybe this request is about the specific texts for one edge at a time? Only wanting to label the connection between object A between object B, and A-B alone. Then this might be a function related to Multi-dimensional Relations.
I have a different feature request that might require implementation of this feature. (FR Type / Relation to represent missing Relation) When criticising a literature for not covering a concept, an indicator for marking on the edge itself could be one way to representing anti-relation.
- An alternative is to have a separate relation specific to this nature of connection.
Contexts of Relation as mentioned in FR Add support for collection-specific relations might also be supportive to texts/symbols on edges.
P.S. Relation is still what fuels my passion for Anytype the most.. not property 
