SSRS reports with connection records as related record type

Hello Guys,

I need to create an SSRS report to run on a sub-grid of connection records,

for example, a contact has family members as connection records and I need to run a report on those records from the sub-grid,

I managed to build the fetch successfully but when I tried to add the report to the CRM online instance, I chose the existing file option but when I came to select connection in the Related Record Types, I couldn't find the Connection entity in the Available values.

I need to run the report from the connection sub-grid itself so is there something that I'm missing or the entity is not there and if the entity is not available for ssrs reporting, is there a work around to eventually run the report on connections?

Thanks in Advance,