I would like to telepot to another certain other place in Minecraft Items that are designated at another location (1.15). Is that possible?
Yes it is possible but you need a plugin I could code it but can only code it for the 1.8-1.13 because the classes are different from 1.14 you can also look for a plugin online!
Ender chests always have the same content, no matter where you place them and are also connected to each other. So it is possible to teleport items.