If I understand correctly you maybe can just ‘add’ the text layers together (concatenate?)
So if you had three ‘edit’ text layers, you use their source texts in an expression and add them together with some spaces….
thisComp.layer(“one”).text.sourceText + (” “) + thisComp.layer(“two”).text.sourceText + (” “) + thisComp.layer(“three”).text.sourceText
Then you have three input layers, One, Two and Three, and one output which reads One Two Three (in this case)