Should work the same as mobile (and probably controller but I was too lazy to test)
source: #community-support message
mobile screenshot attached
#Toggle crouch uncrouches you in containers, inconsistent with mobile
proper dove
there's an internal option for toggle crouch, i'd mess with that instead of presumably faking holding down thee button
proper dove
this is also inconsistent with java toggle crouch even though that's less relevant to bedrock
opal mesa
yes