ESP32 for ST7701S 3SPI 18RGB Display with 3SPI 16RGB Connector

[urSchmax]

Hi there,
I would love to use the GFX library by moononournation but it seems that the ST7701 display controllers are not as implemented as I would like them to be.

I'm using a ESP32-S3 from Waveshare with a WROOM-1-N8R8 module, that got a 40 pin display-connector but only supports 3SPI 16RGB (https://www.waveshare.com/wiki/ESP32-S3-LCD-Driver-Board#Use_Arduino_Demo).
I also got a ST7701S display, that uses a 40 pin display-connector but with 3SPI 18RGB (https://de.aliexpress.com/item/1005007490447257.html).

I already tried to use the Waveshare-Wiki for that, but it seems to be outdated. At least, I am not able to run the demos due to errors in the libraries.
And I am not able to set the pdqGraphicsTest from the GFX-library up.

I know how the pins, but not what protocol I should use to make this work.

Those are the pins given by Waveshare:

displaypin	gpio pin
SDA	1
SCK	2
CS	42
PCLK	41
DE	40
VSYNC	39
HSYNC	38
B1	5
B2	45
B3	48
B4	47
B5	21
G0	14
G1	13
G2	12
G3	11
G4	10
G5	9
R1	46
R2	3
R3	8
R4	18
R5	17
TP_INT	16
TP_SCA	15
TP_SCL	7

Has anyone an idea what I should do to make the display and the ESP workable?