https://lobste.rs/s/r4xf2n/better_generated_branch_names_with_jj#c_nfmydb

You can natively handle commit trailers in Jujutsu’s templating lang. Interesting

[template-aliases]
'trailer_v(key)' = 'stringify(
    if(trailers.any(|t| t.key() == key), 
    trailers.filter(|t| t.key() == key).first().value(), 
  ""))'