Sure, all D&D magic is more properly Thaumaturgy.
The line between Thaumaturgy and Theurgy can be blurry at times, it's not unheard of for the ancient Theurgists to produce miracles at times.
Oh and here is the Chaldean Oracles said be the bible of the Neoplatonists. https://hermetic.com/texts/chaldean
A Thuergist class would require a design that is very different from a cleric or Paladin
More Rituals, getting in contact with their guardian Daimon (not to be confused with a Christian Demon, more like the modern concept of Guardian Angel), of course sensationalized Hollywood Style.
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