I don't think there is anything built in to sigil...yet...although I vaguely remember someone mentioning this before.
One option is to create Clips of all your most common tags. You can have your clips window docked to the side and simply scroll down the list till you find what you want and click on it to enter it into the CV. This would be a bit of effort at first, but it only needs to be done once and it will get you more familiar with the different tags while you do it.
Cheers,
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