The standard package of Jitsi-meet, at the moment, is not compatible with the Arm64 architecture of the Raspberry Pi4. However, it is possible to successfully install Jitsi-meet on the Raspberry Pi4
by recompiling the source code as explained on this web page: https://github.com/jitsi/jitsi-meet/issues/6449
I used a Pi4 with 4GB ram, Linux Ubuntu server 20.04 OS downloaded and installed from the Pi Imager utility. I used Webmin as a remote system interface and Apache2 as a web server. Setting up Jitsi-meet (even without the main extensions) on my home server wasn't easy at all in my case. I moved the Jitsi-meet Linux installation folder from /usr/share/ to /var/www/ and I reconfigured Apache2. In addition, I had to correct the parameters of some configuration files related to Jitsi-meet components such as Prosody, Jicofo, Videobridge, according to the instructions found in the support forum of the Jitsi-meet site.
Jitsi-meet works well on the Raspberry Pi4 as long as you don't open too many conferences and keep the number of participants low. The main limitation in a home installation is the outbound bandwidth limitation imposed by your telecom provider's contractual terms.