How to configure labels in metadata of pod template for Dask Gateway Kubernetes workers non-invasively

Is there any way to configure labels in metadata of pod template for Dask Gateway Kubernetes workers non-invasively?

For example, in spec->template->metadata->lablels:

apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
labels:
app: nginx
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
**app: nginx**
spec:
containers:
- name: nginx
image: nginx:1.14.2
ports:
- containerPort: 80

I think it can be directly added to the "common_labels".

https://github.com/dask/dask-gateway/blob/5771a3ff3734d487f3114ea3ce408dd5fa9133b0/dask-gateway-server/dask_gateway_server/backends/kubernetes/backend.py#L321

Is there any way to do that non-invasively through values.yaml?