What kind of variables are you trying to use? A common approach is to map variables into standard virtual devices – for example, mapping a Boolean variables into a Virtual Switch.
Alternatively, you could use a custom driver for mapping Hubitat variables into - for example, I put together a custom driver which has slots for switches, numbers, and text in the following post:
Edit: And for the sake of completeness, it’s worth mentioning that SharpTools Variables can be exposed natively to your SharpTools Dashboards.