API - Get host if member of specifig group

Hello,

I’m trying to use the Icinga API to retrieve host groups information.
I would like to know if it exists a request when I specify a host and a hostgroup and the API replies a boolean to determine if the specified host is member of the specified group.

This requests gives all members of a group :
curl -k -s -S -i -X GET -H 'Accept: application/json' -u 'user:password' 'https://ICINGA_IP:5665/v1/objects/hosts?filter=%22GROUP1%22%20in%20host.groups'

This other request gives all groups of the specified host :

curl -k -s -S -i -X GET -H 'Accept: application/json' -u 'user:password' 'https://ICINGA_IP:5665/v1/objects/hosts?host=hostname&attrs=groups

How can I specify the hostname AND the hostgroup in the same request ?
I tried with ?filter without success.

If the hostname is member of the hostgroup, then reply.
If not, reply an error or “object not found”.

Can someone help me ?

this returns either the host object or an empty result:

curl -k -s -S -i -X GET -H 'Accept: application/json' -u 'root:password' -H 'X-HTTP-Method-Override: GET' -X POST -d '{ "filter": "host.name==hostname && group in host.groups", "filter_vars": { "group": "YOURGROUPNAME", "hostname": "YOURHOSTNAME" }, "pretty": true }' https://localhost:5665/v1/objects/hosts