How to template chunk specs?

I have a use case where I'd like to catalog NEMO data and chunk depth dims which are called differently (`deptht`, `depthu`, ...).

The following explains (I hope), what I want to achieve:
```yaml
[...]
sources:
NEMO-Exp01:
description: NEMO-Exp01
driver: netcdf
parameters:
grid:
description: grid
allowed: ["t", "u", "v", "w"]
default: "t"
type: str
args:
urlpath: '/data/NEMO-Exp01/NEMO-Exp01_1m_20010101_20011231_grid_{{ grid.upper() }}.nc'
chunks: {'depth{{ grid }}': 1, }
[...]
```

Is there a short way of doing this (without having 34 different entries that only differ in their grid)?