The requirement for the jam says:
Your game needs to be made with the LÖVE framework. If possible provide a .love file with the rest of your builds, and clearly state which version of LÖVE was used.
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LÖVE has multiple ports that allow you to write code using LÖVE APIs in a different platform, like LÖVE Potion does for WiiU, Switch and 3DS.
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LÖVE has multiple wrappers that allow you to write code in a different language but still use LÖVE framework’s API to create a game, like Love Sharp that allows you to use C# with LÖVE.
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LÖVE has nightly builds for the next version of LÖVE which allows you to use unreleased features in your games. There are also older versions of LÖVE that you can use for whatever reason.
These are all considered to be LÖVE or part of LÖVE (even if not officially).
We recommend you stick to vanilla LÖVE on the latest stable release because it’s easier for people to play your game if you just bundle a .love file.
LOVR is a framework inspired by LÖVE. It is not a port since it runs in the same platforms as LÖVE. It is not a wrapper since you use Lua like you would with LÖVE and doesn’t interact with LÖVE APIs. It is not a nightly build or older version of LÖVE.
So no, LOVR is not part of LÖVE and is not allowed in the jam.