Adding attributes to relations in Graphaware TimeTree

Hi, a quick question, is there a way to add attributes to the relations from an existing node to the timetree using graphaware timetree? To be precise, in the example given on the Github page (https://github.com/graphaware/neo4j-timetree), say, I want to add a numeric attribute to the relation ‘SENT_ON’, what would be the best way to do so. Thank you!