label text is not close to edges, any clue?

[a-panda-rar]

label text is not close to edges, any clue? some of my label textlines are far from it's edge lines, any parameter to set or any trick can fix this issue? thank you, i'm very new to diagrams. below is my first chart generated by diagrams.

[a-panda-rar]

minlen parameter can get label closer to edge line, but it makes my blocks not aligned. my code for reference.
charge >> Relationship("提供车辆充电枪和放电枪连接状态", style='solid') >> gear
drive >> Relationship("提供车辆充电枪和放电枪连接状态", style='solid') >> gear
gear >> Relationship("提供车辆充电枪和放电枪连接状态", style='solid') >> tow
towmode >> Relationship("提供车辆充电枪和放电枪连接状态", style='solid') >> gear
gear >> Relationship("提供车辆档位状态", style='solid') >> torque
gear >> Relationship("请求EPB拉起释放", style='solid', minlen='2') >> park
gear >> Relationship("提供车辆档位状态", style='solid', minlen='3') >> console
gear >> Relationship("档位控制信息", style='solid', minlen='4') >> battery