When using typographic tokens and variables that have pre-determined values for the line-height, the only way to alter the line-height is to detach the variable from the text element and then manually edit the values in the "Type settings" palette. This essentially defeats the purpose of using tokens and variables and makes the detached item hard to update quickly in the future.
Please consider adding more typographical overrides in the "Type settings" palette so that we can change the values without breaking the variable connection.