How to convert presets into luts ?

Hi there,

Thanks for reaching out.

Which version of Lightroom and Windows are you using? It is possible to convert Lightroom preset into a LUT but with the help of other plugins, which we cannot recommend. 
You can check the steps here: https://photography.tutsplus.com/tutorials/how-to-lightroom-preset-into-lut--cms-39980.

Hope this helps.

Regards,

Ranjisha