While Eclair itself doesn't provide the information, you can use the information from Eclair to look up the capacity using some other block information provider.
The capacity of channels is not part of the gossip information broadcast over the Lightning Network. The capacities are looked up on the blockchain from the shortChannelId, which fortunately is ...
Click the three dots in the top right corner, tap "Network Info".
Your NodeId is visible on this screen
Now, go to the URL ip.tyk.nu to find your IP address.
Now, in a Linux prompt (or WSL), install the PyPI qrcode package. On Ubuntu, it is available in the python3-qrcode package.
Now, execute this command (substitute the values you just learnt):