Here's an example that should work with as many items in your array as you want. Effectively, it builds up the filter for each item separated by an or clause.
Full flow below. I'll go into each of the actions.
Compose contains your array of items.
Select will build up an array of individual conditions. The expression used here is:
concat('Title eq ''', item(), '''')
If I ran my flow now, I'd get the following output from my Select:
[
"Title eq 'First'",
"Title eq 'Second'"
]
Join will join each of the items above, separated by ' or '.
The output from my Join would be:
Title eq 'First' or Title eq 'Second'
Get items can then use the output from the Join as the Filter Query we need.
