How to get only all ''title'' elements in to a label with coma from tinydb ( ListView with image)

[Zignec_Bdr (Zignec)]

I tried but i couldn’t get the data only all saved “title” elements with a button click in to a label separated with coma. Please help.

[Gaston (zodiaclogic)]

[Zignec_Bdr (Zignec)]

Thank you Gaston, but i cannot get the numbers in the Lable at all. I get only one number like in the picture here. how can i get all the numbers with coma?