Link in the loop

Hi, I wanna do a full screen button on the thumbnail that opens the full image like this plugin.
Example in the loop
View full size
And I saw that the plugin uses “data-postid” and “data-imgid”.
¿How can I get that values of the picture inside the loop, if is possible?
Thank you so much.

https://ww.wp.xz.cn/plugins/fullscreen-galleria/