Javascript (ES6), 121 110 bytes

-11 Bytes thanks to @Shaggy

m=>`[[${(a=m.split`
`.map(x=>x.trim().replace(/ +/g,", "))).join`], [`}]]
{{${a.join`}, {`}}}
[${a.join`; `}]`"

Example code snippet:

f=
 
m=>`[[${(a=m.split`
`.map(x=>x.trim().replace(/ +/g,", "))).join`], [`}]]
{{${a.join`}, {`}}}
[${a.join`; `}]`
 
console.log(f(
`1 -2
 3  5
 6  7`
))

Javascript (ES6), 121 110 106 bytes

-15 bytes thanks to @Shaggy and @Justin

m=>`[[${(a=m.split`
`.map(x=>x.match(/\S+/g).join`, `)).join`], [`}]]
{{${a.join`}, {`}}}
[${a.join`; `}]`

Example code snippet:

f=
m=>`[[${(a=m.split`
`.map(x=>x.match(/\S+/g).join`, `)).join`], [`}]]
{{${a.join`}, {`}}}
[${a.join`; `}]`
console.log(f(
`1 -2
 3  5
 6  7`
))

Javascript (ES6), 121 bytes

s=>s="[["+(s=s.trim().replace(/(.) +/g,"$1, ").split(/\n */)).join("], [")+`]]
{{`+s.join("}, {")+`}}
[`+s.join("; ")+"]"

Example code snippet:

f=

s=>s="[["+(s=s.trim().replace(/(.) +/g,"$1, ").split(/\n */)).join("], [")+`]]
{{`+s.join("}, {")+`}}
[`+s.join("; ")+"]"

console.log(f(
`1 -2
 3  5
 6  7`
))

Javascript (ES6), 121 110 bytes

-11 Bytes thanks to @Shaggy

m=>`[[${(a=m.split`
`.map(x=>x.trim().replace(/ +/g,", "))).join`], [`}]]
{{${a.join`}, {`}}}
[${a.join`; `}]`"

Example code snippet:

f=

m=>`[[${(a=m.split`
`.map(x=>x.trim().replace(/ +/g,", "))).join`], [`}]]
{{${a.join`}, {`}}}
[${a.join`; `}]`

console.log(f(
`1 -2
 3  5
 6  7`
))

Javascript (ES6), 120 bytes

s=>s="[["+(s=s.trim().replace(/(.) +/g,"$1, ").split(/\n */)).join("], [")+`]]
{{`+s.join("}, {")+`}}
[`+s.join("; ")+"]"

Example code snippet:

f=

s=>s="[["+(s=s.trim().replace(/(.) +/g,"$1, ").split(/\n */)).join("], [")+`]]
{{`+s.join("}, {")+`}}
[`+s.join("; ")+"]"

console.log(f(
`1 -2
 3  5
 6  7`
))

Javascript (ES6), 121 bytes

s=>s="[["+(s=s.trim().replace(/(.) +/g,"$1, ").split(/\n */)).join("], [")+`]]
{{`+s.join("}, {")+`}}
[`+s.join("; ")+"]"

Example code snippet:

f=

s=>s="[["+(s=s.trim().replace(/(.) +/g,"$1, ").split(/\n */)).join("], [")+`]]
{{`+s.join("}, {")+`}}
[`+s.join("; ")+"]"

console.log(f(
`1 -2
 3  5
 6  7`
))