Should I include colon in my msgid in PO file?

The use of each depends on your choice. If, for example, the text is in front of a field, I think it is better to use the symbol:
In general, you should see if it really needs it or not. You do not have to use it or not. In the text you sent, the first option is more appropriate because the intention is to display a value in front of or below this text

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