shell script: Returning wrong output - bash

Question

In the given script, the nested key is not getting appended with the value. I could not figure out where the script is going wrong.
#!/bin/bash
echo "Add the figma json file path"
read path
figma_json="$(echo -e "${path}" | tr -d '[:space:]')"
echo $(cat $figma_json | jq -r '.color | to_entries[] | "\(.key):\(.value| if .value == null then .[] | .value else .value end)"')
Sample input:
{
"color": {
"white": {
"description": "this is just plain white color",
"type": "color",
"value": "#ffffffff",
"extensions": {
"org.lukasoppermann.figmaDesignTokens": {
"styleId": "S:40940df38088633aa746892469dd674de8b147eb,",
"exportKey": "color"
}
}
},
"gray": {
"50": {
"description": "",
"type": "color",
"value": "#fafafaff",
"extensions": {
"org.lukasoppermann.figmaDesignTokens": {
"styleId": "S:748a0078c39ca645fbcb4b2a5585e5b0d84e5fd7,",
"exportKey": "color"
}
}
}
}
}
}
Actual output:
white:#ffffffff gray:#fafafaff
Excepted output:
white:#ffffffff gray:50:#fafafaff
Full input file

Answer 1

Here's a solution using tostream instead of to_entries to facilitate simultaneous access to the full path and its value:
jq -r '
.color | tostream | select(.[0][-1] == "value" and has(1)) | .[0][:-1]+.[1:] | join(":")
' "$figma_json"
white:#ffffffff
gray:50:#fafafaff
Demo

Answer 2

An approach attempting to demonstrate bash best-practices:
#!/bin/bash
figma_json=$1 # prefer command-line arguments to prompts
[[ $figma_json ]] || {
read -r -p 'Figma JSON file path: ' path # read -r means backslashes not munged
figma_json=${path//[[:space:]]/} # parameter expansion is more efficient than tr
}
jq -r '
def recurse_for_value($prefix):
to_entries[]
| .key as $current_key
| .value?.value? as $immediate_value
| if $immediate_value == null then
.value | recurse_for_value(
if $prefix != "" then
$prefix + ":" + $current_key
else
$current_key
end
)
else
if $prefix == "" then
"\($current_key):\($immediate_value)"
else
"\($prefix):\($current_key):\($immediate_value)"
end
end
;
.color |
recurse_for_value("")
' "$figma_json"