store the list in a file comma separated like this
item1,item2,item3,item4
read it using the file component on first run of the app and convert it into a list using the list from csv row block, thn store the list in TinyDB for further use
alternatively store the list in a file like this
item1
item2
item3
item4
read it using the file component on first run of the app and convert it into a list using the split block, just split at \n (new line), then store the list in TinyDB for further use
Taifun