Firebase and WebSockets on the same ESP32 seem to clash because of JSON

Hi all, I try to get the “firebase_ESP_client” together with websockets running on the same ESP32. But both seem to use identical JSON definitions, so during compilation I get dozens of errors (see at the end of my post).
 
This is my configuration:
– ESP32 running in WiFi mode softAP plus station AP: “WiFi.mode(WIFI_AP_STA);”
– I use AsyncTCP + ESPASyncWebServer + ASyncElegantOTA
– I can start an AsyncWebserver + Websokets, and I can distinguish between traffic from SoftAP and StationAP.
– the handler of websockets uses a function “handleWebSocketMessage()” which in turn gets the states from a function “getOutputStates()”, and in this function there is a JSON-structure which depends on the include-file named “Arduino_JSON.h”. I got this idea from your book “Build Web Servers with ESP32…” / modue 3 / chapter 2.5 for example.
– When I comment “#include Arduino_JSON.h” and clear “getOutputStates()” everything compiles just fine, and my two APs (soft and station) are responding, but the websocket obviously is silent.
So my conclusion is that firebase_ESP_client and websockets both use JSON from different include-files and the two files use the same names (see error messages below). What can I do to get websockets running?
 
Why do I have this configuration?
– I would like to have a simple webserver running on port 80 on my softAP. I can onnect to this website over WiFi. This website contains a simple webformular to enter new SSID and PASS. SSID and PASS get stored via SPIFFS
– When I reboot my ESP32 the stationAP connects with this freshly configured SSID / PASS to the internet and connects to my firebase.
– The softAP and its IP is static, that way I can always connect to them. That way I can configure the stationAP with different SSIDs, because I want to use my ESP32 in different locations.
 
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libraries/Arduino_JSON/cjson/cJSON.c.o: In function `cJSON_GetErrorPtr’:
/home/nutzer/Dokumente/Arduino/Sketches/libraries/Arduino_JSON/src/cjson/cJSON.c:71: multiple definition of `cJSON_GetErrorPtr’
libraries/Firebase_Arduino_Client_Library_for_ESP8266_and_ESP32/json/cJSON/cJSON.c.o:/home/nutzer/Dokumente/Arduino/Sketches/libraries/Firebase_Arduino_Client_Library_for_ESP8266_and_ESP32/src/json/cJSON/cJSON.c:103: first defined here
libraries/Arduino_JSON/cjson/cJSON.c.o: In function `cJSON_Version’:
cJSON.c:(.text.cJSON_Version+0x0): multiple definition of `cJSON_Version’
libraries/Firebase_Arduino_Client_Library_for_ESP8266_and_ESP32/json/cJSON/cJSON.c.o:cJSON.c:(.text.cJSON_Version+0x0): first defined here
libraries/Arduino_JSON/cjson/cJSON.c.o: In function `cJSON_InitHooks’:
cJSON.c:(.text.cJSON_InitHooks+0x0): multiple definition of `cJSON_InitHooks’
libraries/Firebase_Arduino_Client_Library_for_ESP8266_and_ESP32/json/cJSON/cJSON.c.o:cJSON.c:(.text.cJSON_InitHooks+0x0): first defined here
…etc