You can use the progranm amdgpu-top to show details about resouce comsumption (like VRAM) of your GPU.
Before you can install it, you need to install some packages:
sudo apt purge -y rustc rustc-* cargo
sudo apt install -y clang libdrm-dev
You can install rustup and cargo with these commands:
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
Now you need to close and re-open your terminal window. Then you can clone the Github-Repo and start the installation:
git clone https://github.com/Umio-Yasuno/amdgpu_top
cd amdgpu_top
cargo install --locked --path .
You can open the program easily with the command amdgpu_top