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I don't think that's how the templates are supposed to be used
I cant write so much i am spanish
what is difficulty= set to in your server.properties file? By default (even on a Vanilla server), this is set to easy. See https://bugs.mojang.com/browse/MC-136161. You need to change the difficulty to either normal (50% chance of zombification) or hard (100% chance of zomibifcation). Note that these are vanilla mechanics, and not the fault of Paper.
I'm using paper version 100 and I have difficulty set to hard on server.properties and I'm also experimenting this issue. I've tried editing the "zombie-villager-infection-chance" parameter in paper.yml with no success
Fill the template if you wish for anything to happen.
Setting the server to hard difficulty or zombie-villager-infection-chance to 100.0, you'll get the desired outcome.
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I don't think that's how the templates are supposed to be used