Lightroom desktop will accept exported develop presets. Just make sure you use the correct way of importing them. Do not try to import them as if they are photos, import them from the presets panel. Once imported in Lightroom desktop they should automatically sync to Lightroom Mobile.
If you mean Export presets, then you are out of luck. Export presets are not supported in Lightroom cloud.
You have to use a RAW file type but it's possible! Create the preset on your image, go to File > Export as Preset > Export as DNG. Send that image to your phone (I airdropped mine but you could email it as well). Open the DNG file type in Lightroom Mobile > 3 dot icon in top right > Create Preset > choose what features you want to include and name it!
Please do not 'revive' a two years old thread. Nobody is still waiting for an answer in this discussion, and obviously the situation may have changed considerably in those two years (but export presets are still not supported in Lightroom). Also note that an export preset is not the same as exporting a (develop) preset...