I ni ce, Christy!
That’s a good option and very natural!
That said, it doesn’t necessarily carry the same message given that it literally means “in truth”. For instance, you could say something positive with it:
Tiɲɛ na, bamanankan ka di
‘Truly, Bambara is pleasant’
Which makes me think that maybe the topic about “sadly” has some answers to my own question 
.