In reply for @natasha.l : I mentioned on the starting post that these attribute definitions are from blocks that have been exploded. Therefore I was not able to use BURST command as suggested. If I understood right, this command can disassemble blocks or block references into elements that these were actually created in first place and retain their original values. Therefore BURST is not able to disassemble attribute definitions which are from blocks that have been exploded.
I also tested the TXT2MTEXT command and it lacks feature to convert individual texts to mtext. If I understood right, this command merges all selected texts to one massive mtext. Therefore this does not suit my needs. Therefore I searched for LISP to change individual texts to individual mtexts from page provided by @pendean. I found LISP from there to achieve this and it actually worked. Here is a link to the LISP
http://cadtips.cadalyst.com/multiline-text/convert-text-mtext-without-changing-justification
I thought that it would be nice to use this for all text elements that were present in the dwg I used for testing. This was not possible because the formations of texts were converted in wrong way. If I understood right, this happens because when converting text to mtext, the command interprets each space that is present in converted text - will be seen as line change (pressing enter). Therefore texts will end up one on the other.
LISP provided by @pendean worked as intended and converted attribute definitions to text elements. The problem mentioned above was not present with these text fields when I converted them into mtext since they were attribute definitions before and therefore these elements can not contain any spaces.
I looked for other LISPs that would not have problem with conversion of texts including spaces but were not able to find one. Then I thought that if I replace the spaces with _ (underlines), the problem would not occur. This is yet to be tested. Please feel free to comment if theres another workaround for this problem!
I hope this answer and thread will be help others having hard time with same problem.
AutoCAD 2022