𝐅𝐄𝐀𝐓𝐔𝐑𝐄𝐒𝐓𝐈𝐂 𝐋𝐄𝐀𝐊𝐒

static float cnt = 0.0f;
                const float RainbowSpeed = 8.0f;
                const int RainbowColorCount = 7;
                const float FullCircle = 360.0f;
                const float IncrementValue = 0.02f;

                FLinearColor rainbowColors[RainbowColorCount] = {
                    FLinearColor(1.0f, 0.0f, 0.0f, 1.0f),
                    FLinearColor(1.0f, 0.5f, 0.0f, 1.0f),
                    FLinearColor(1.0f, 1.0f, 0.0f, 1.0f),
                    FLinearColor(0.0f, 1.0f, 0.0f, 1.0f),
                    FLinearColor(0.0f, 0.0f, 1.0f, 1.0f),
                    FLinearColor(0.5f, 0.0f, 1.0f, 1.0f),
                    FLinearColor(1.0f, 0.0f, 1.0f, 1.0f)
                };

                int rainbowColorIndex = static_cast<int>(fmod(cnt * RainbowSpeed, RainbowColorCount));
                FLinearColor color1 = rainbowColors[rainbowColorIndex];
                FLinearColor color2 = rainbowColors[(rainbowColorIndex + 1) % RainbowColorCount];
                float rainbowPhase = fmod(cnt * RainbowSpeed, 1.0f);
                FLinearColor interpolatedColor = FLinearColor(
                                                     color1.R + (color2.R - color1.R) * rainbowPhase,
                                                     color1.G + (color2.G - color1.G) * rainbowPhase,
                                                     color1.B + (color2.B - color1.B) * rainbowPhase, 1.0f);
                Data::localController->CrossHairColor = interpolatedColor;

                if (cnt >= FullCircle) {
                    cnt = 0.0f;
                } else {
                    cnt += IncrementValue;
                }
            }

Rainbow Crosshair Code 🌈

Imgui Supported, other src I don't know

Build Frida on Android By Abhi

How hard can it be to build Frida natively on Android in Termux (without NDK)?

https://qbtau.in/posts/building_frida_on_termux/