Contain display filter?

As far as I know there is no way to use a display filter on the contents of the Info column. However, you can use the "Find" function (ctrl-F) to search for info in the packet-list (which includes the Info column). Set your search type to string and choose "packet list" as "Search in..." option.

Another possibility might be to run tshark from the command-line and then pipe its output to grep. For example:

tshark -r file.pcap -Y "filter of interest" -T fields -e frame.number -e _ws.col.Info | grep "search string of interest"

That will give you a list of frame numbers containing your item of interest. You can then use those frame numbers as a reference when looking at packets in Wireshark (or for whatever other purpose you might have).

I think this should get you going.