No, Custom Tiles run in their own sandboxed context so they don’t have access to SharpTools devices or variables.
Super Tiles have access to device and variable data from SharpTools and can be used to build custom layouts… but if I remember correctly, you had built more of a fully custom tile that needed the HTML / JavaScript features of Custom Tiles.
Feel free to create a feature request to be able to access device data from a Custom Tile… and/or you might want to vote on this existing feature request for Access to SharpTools Variables in Custom Tiles.