Hi,

Sometimes there is a description in postman calls. As an example you can take a look at SRV6 calls. Several put calls contain a description where you can see vpp equivalent call using CLI. That may help you to see the similarities between cli call and HC rest call.
Example:
Put for End Base variant local sid B::100:
http://localhost:8183/restconf/config/hc2vpp-ietf-routing:routing/hc2vpp-ietf-srv6-base:srv6/locators/locator/b::/static/local-sids/sid/100
{
"hc2vpp-ietf-srv6-static:sid": [
{
"opcode": 100,
"end-behavior-type": "ietf-srv6-types:End",
"end": {}
}
]
}

And vpp cli equivalent in description
vppctl sr localsid address B::64 behavior end (in dec format opcode value is 100)

here you can see how local sid address is constructed from locator (B::) and opcode (100 which in hex equals 64)
Not all VPP parameters are always mapped 1:1 directly to yang model, but usually there is at least some note or description either in examples or in yang model augmentations for VPP in honeycomb.

Michal