Jq: How can I parse a json whose key starts from numeric string

[sonots]

I have a json like

{"2xx_count":10,"3xx_count":11}

but, I get errors as followings:

$ echo '{"2xx_count":10,"3xx_count":11}' | jq .2xx_count
error: syntax error, unexpected IDENT, expecting $end
.2xx_count
  ^^^^^^^^
1 compile error

[lluchs]

echo '{"2xx_count":10,"3xx_count":11}' | jq '.["2xx_count"]'

[sonots]

@lluchs thanks!

[vjcalel]

@lluchs

How to do that with key_name as variable ? For example

cat data.json | jq '.["$1"]' where $1 is the first paremeter ?