json_script and concatenate variable name

Question

I need to concatenate the variable name from a template variable and hand it to the json_script template tag. I tried:

{% with sensorname|add:"-data" as SensorNameData %}
    {{ values|json_script:SensorNameData }}    
    output: {{ SensorNameData }}
{% endwith %} 

Which did not work, so I created a filter templatetag:

@register.filter
def combined(str1, str2):
    return f"""{str1}{str2}"""

and tried:

    {{ values|json_script:sensorname|combined:"-data" }}    

but when applying it, I end up with the parsed list of values and then -data. Can I somehow tell the template processor to validate sensorname first and then values|json_script:xxx?