documentclass[]{article}
usepackage{expl3}
begin{document}
ExplSyntaxOn
 tl_new:c {l_uf_some!special!name_tl }
 tl_set:cn{l_uf_some!special!name_tl }{special blub abc }

 tl_new:N l_uf_some_tl
 tl_set:Nnl_uf_some_tl {xxxblub abc }

 prop_new:N l_uf_some_prop
 prop_put:Nnxl_uf_some_prop {some}        { some~text~exp_args:No exp_not:n { l_uf_some_tl } }
 prop_put:Nnxl_uf_some_prop {somespecial} { some~text~exp_args:Nc exp_not:o { l_uf_some!special!name_tl } }
 prop_show:N l_uf_some_prop

ExplSyntaxOff

end{document}

The property list l_uf_some_prop contains the pairs (without outer braces):
>  {some}  =>  {some text xxxblub abc}
>  {somespecial}  =>  {some text specialblub abc}.