Hi lalasisi
The best way to propose features to Sisense is via their Product Feedback forum
Per your question about combining the abiltiy to combine texts and aggreagated data - this is a comemrcial solution. It can do it all and much more as it was desgined from the start to be a comperhansive solution to all scenarios where the simple out of the box table/pivot widget is not sufficient.
We can hop on a quick call and I'll show you how it works. Its really simple and we offer free trials to all our plugins so you can just try it on your server to verify that it fit to your use case (:
Another option would be to customize your own solution using BloX.
The guys from RapidBI had pasted a great script below so you can take and tweak it to suite your needs. This is a reasonable (and free) altarnative if you have only a few places that this needs to be implemented without too many addiotnal requirements.
https://community-old.sisense.com/hc/en-us/community/posts/360039619893-Transposed-Pivot-Table-With-BloX